Freezing point depression lab report chegg

Freezing point depression lab report chegg. 0 mL was then thoroughly mived with 225 mL of deionized water. com Here’s the best way to solve it. Using Freezing-Point Depression To Find Molecular Weight Pre-lab questions Name: 1. Mass of lauric acid used 10. 24–Oct 12, 2023 among a random sample of U. POST-LAB 27 LABORATORY 2 | DETERMINATION OF THE MOLECULAR WEIGHT: POST-LAB 3. 0 Temperature (°C) Acetic Acid (Unstirred) 94- Temperature (°C) Mixture (Stirred) Temperature (°C Question: Lab Report The Determination of Ke-Freezing Point Depression Constant for Glacial Acetic Acid CH3COOH 140. The lab will open in the Calorimetry laboratory with a beaker containing 45. 3333 1. Preparation of Experimental Apparatus and Freezing Point Determination of Lauric Acid Mass of freezing point depression apparatus * Mass of freezing point depression apparatus with lauric acid 3. The slushy/cloudy point is usually higher due to non-equilibrium conditions caused by incomplete mixing etc. sure to cite this protocol for this literature value in your lab report). b. For each trial find the molaityor the experimental solution (show your work). 3 Answer a. Lab Report: Determination of Molar Mass by Freezing Point Depression Experimental Data Unknown ID number Part 1 - Freezing Point of Pure PDB Mass of large empty test tube 30. When you repeated this measurement, the sample again began to freeze at 47. Determining the Gram Molar Mass of the Unknown mass of t-butyl alcohol, test tube, and flask, g mass of test tube and flaskg wele e19 Rog mass of t-butyl alcohol, g solid unkniown number mass of solid unknown welghing Question: < COLLIGATIVE PROPERTIES. When the molar Mass is most higher tha …. 3 Volume (mL) of acetic acid in Unknown 19. Solution 1: Ice formed at 36⁰° after 2 hours and 30 minutes. 0 51. Ans 1 : freezing point of water = 0oC Freezing point depression = 0oC - (-10oC) = 10oC …. 6 g of. When the small circles on each cursor line overlap each other at the intersection, the temperatures shown in either examine box should be equal to the freezing temperature for the benzoic acid-lauric acid mixture. 211 g Mass of test tube & PDB 61. The slushy/cloudy point is the temperature at which the first solid material begins to form. Mass of Test tube in flask (g) 2. Mass of solute (#3-#4) 7. Question: Lab: Colligative Properties: Freezing Point Depression Procedure In this exercise, you will determine the freezing point of tap water and 2 solutions with varying amounts of salt Materials provided: plastic cup, scale, 100ml beaker, thermometer (or kitchen thermometer that goes to -5°C). 0337 66. 1. 51 110. 0 2. Lab Report Instructions: Below you will find specific instructions for the three sections I want to see in your lab report: 1) Introduction 2) Data A determination study of the freezing point depression constant (K) for tert-butyl alcohol (TBOH) and the Molar Mass of an Unknown compound Abstract: There were three main objectives in this experiment that we were trying to determine. Question: I need help on a summary section of a lab report on Molar Mass and Freezing Point Depression. 0 kg of water? 5. Using Freezing Point Depression to Determine the Molar Mass of a Solid OBJECTIVES • To determine the freezing temperature of a pure liquid solvent, cyclohexane, (C. 20 van't Hoff factor PHASE 4: Prepare aqueous solution 1 Complete the following steps: Place used graduated cylinder into Wash/Waste bin Place weigh boat on balance. 86 °C-kg-mol Normal freezing point of water:0°C For freezing point depression and boiling point elevation, these equations are: Δ T r = k q ⋅ m Δ T b = k b ⋅ m where Δ T 1 and Δ T t are the changes in the freezing point and boiling point of the solution compared to pure solvent, K f and k h are the freezing point depression and boiling point elevation constants for the solvent, and m This question will give you practice doing this before you come to lab. Average freezing point 9. 5°C 24. 6 Volume (mL) of water in Unknown 1. 5°C 7. 860C/m. See Background information part of this lab to help with data processing. FREEZING-POINT DEPRESSION INTRODUCTION LABORATORY SIMULATION A Lab Data Molar mass (o/mol) 74 55 Did you account for the freezing point of your D/ water? 74 55 48. 5. The freezing point is the constant temperature over the 3 minute interval. FREEZING-POINT DEPRESSION ORY SIMULATION Lab Data Glucose Molar mass (g/mol) Mass of calorimeter (g) Volume of DI water (mL) Mass of glucose (g) Moles of glucose (mol) Mass of calorimeter + solution (g) Mass of calorimeter + solution + ice (g) Freezing-point of solution ("C) Mass of calorimeter + ice after decanting (9) Mass of ice added (9) Mass of ice remaining after decanting (9) Mass of Show B. Question: Experiment \#3: Determination of Molar Mass Using Freezing Point Depression Report Form Attach a complete copy of your lab notebook to this report. Use your value for the freezing point of lauric acid. The freezing point of the solution is 37. Figure 16. TABLE 1: Trial 1 For trial 1, show all work: Include formula (s) used in the calculation Plug in the numbers WITH UNITS. 354 30. The freezing point depression can be predicted using the equation ΔT = K f . Make sure you understand it before you go any further. Question: Freezing Point Depression Lab Pre-Lab A student completed parts A & B of this lab and got the following data for a liquid unknown: Part A: lowest observed temperature in ice- water mixture: 0. customers who used Chegg Study or Chegg Study Pack in Q2 2023 and Q3 2023. Lab 13 Molecular Mass Determination by Freezing Point Depression in t-Butyl Alcohol Ill. Place a small circle on the graph you sketched that accurately represents the freezing temperature Water Urea NaCl oc 6 6 2 0° 1. 22 17. com Chemistry questions and answers. CHEM 1232 Fall 2020 Freezing Point Depression Post-lab Questions 1. 97338 43 36 oC oC oC mol g/mol Show all your calculations for the determination of 1. 1) (10. For each trial find the moles of solute (show your work). 7532 3. 86 Freezing-point depression constant ("C/m) Freezing-point of DI water (*C) 62 0. 86 0 0 Try 1 (1 point) Chemistry questions and answers. Unknown ID Weight of unknown used Weight of benzophenone used Freezing point ofpure benzophenone- Freezing point of mixture Freezing point depression, AT Molality of solution containing unknown Number of moles of unknown used Molecular weight of unknown 0480 1. 13. Solution had 1 teaspoon of salt and 1 Cup water. Question: Experiment 3 Pre-Lab Report Sheet. 6°C Trial 2: 11. 365 g 38. 7 6. 4. c) part of the unkown solute fails to dissolve. 074molal …. 8 Lab Data Volume of DI water (mL) Verify your FREEZING POINT DEPRESSION LAB. 4°C Average freezing point of hexane_6. 1 deg C [ given] Kf is the molal depression cons …. ) Table 1: Data Table Compiete the table below using your data from Table 1. Question: Experiment 7: Freezing Point Depression and Supercooling Questions 1. equal 236. 558 ml of H₂0 Freezing point Solution 2: Ice formed at 35⁰ after 3 hours. Freezing Point Determination of a Lauric Acid Solution 4. 20 o C. Hi2). You'll use this property to determine the molar mass of an unknown compound. 86"C/M. These include freezing point depression, osmotic pressure, and boiling point elevation. Question: FREEZING POINT DEPRESSION OF WATER BY GLUCOSE REPORT SHEETNAMIELAB PARTNEK(DATEPart B, Freezing point of waterMass of test tubeMass of test tube with waterMass of waterFreezing Point of water (From graph)Part C, Effect of Glucose5. 0 1. Colligative properties (sections 3. FREEZING POINT DEPRESSION LAB DATA Freezing Point (°C) of pure acetic acid 17. What is the actual accepted value of the freezing Question: Lab Data Did you report your data to the correct number of significant figures? Freezing-point depression constant (∘C/m) 1. Compare the experimental value you determine to the theoretical value and discuss any differences. 15g mass=8. Ethylene glycol, C,H,O, is a common automobile anti-freeze. 050 kg …. ang Freezing point of Answer to Solved 06 10 2. Hint: Look at the units for Kf and the units of the values being graphed. molarity ° For each trial: 2. Obtain: -12 regular sized ice Question: Experiment 15 Freezing Point Depression Note: You will need a watch with a second hand or digital display for this experiment. ACTIVITY REPORT: ICE CREAM MAKING Colligative properties are properties of solutions that depend on the number of solute particles dissolved in the solution. This property, known as freezing-point depression, is a colligative property, that is, it depends on the ratio of solute and solvent particles, not on the nature of the substance itself. F 8. 473 23. CHEM 1212 Lab Manual 6th Edition 30 REPORT SHEET Name Partner Part A: Determination of the freezing point of cyclohexane Name of solvent: Cyclobexarige Mass of solvent: 1. Use the values of experiment 2 AT, = Kb Kr of water: 1. 1568 12:1912 Freezing point of pure cyclohexane 7. Question: Name Pre-Lab Questions: Freezing Point Depression Lab Section Read the description of the experiment. 50 g of decanol in 21. Preparation of Experimental Apparatus and Freezing Point Determination of Lauric Acid 63. 2018 7,5°C 7. 2oC c. Solution : 3) Mass of water in kg = 0. 364 3. Data and observations for Trial 2. 45 47. 5 48. 25∘C. 0 -1,0 -20 liquid liquid and solid sod 40 5 2 11 13 15 REPORT Your lab report should contain the following information: 1. 1: The vapor pressure of a solution (blue) is lower than the vapor pressure of a pure solvent (pink). ) Table 2: Analysis Does the freezing point measured in this experiment agree with the accepted value? If it does not, suggest a. Pure benzophenone melts at. Lab Submission - Freezing Point Depression Molar Mass of a Solute Using Freezing Point Depression Are you completing this experiment online? Yes Data Collection Weight of empty test tube and beaker (m) Weight of test tube, beaker, and stearic acid (9) Time and Temperature Data: Cooling Curves 58. 2014 162. Tf = Kf x m Where Tf is the depression in freezingpoint = 2. What are the freezing point of the Record the freezing temperature in your lab notebook. 2049 Mass of cyclohexane 12. 1°C/m) In the Freezing Point Depression experiment, you will calculate the colligative molality of the solutions you produce, the freezing point depression, and the predicted boiling point of the resulting Step 1. experiment 1. 10 CaCl Calculate the Molar Mass of Each Compound: Glycerol, CsH,O, . 0 freezing point b Temperature (C) 0. 0°C. Question: EXERCISE 12 DATE NAME LAB SECTION Report The Freezing Point Depression Constant of Cyclohexane Trial 1 Trial 2 Trial 3 Data: Mass of test tube and beaker 150053, 150. Get four FREE subscriptions included with Chegg Study or Chegg Study Pack, and keep your school days running smoothly. 6 ) are properties of a solvent that a solute affects, like the freezing or boiling point of the solvent. 1) Δ T f = T f o − T f = K f × m c. These are my results: Table 1: Freezing Point Temperatures Here’s the best way to solve it. Question: REPORT SHEET EXPERIMENT Freezing Point 19 Depression A. 33 4T = Kim Notes for Freezing Point Depression Lab Print the entire handout for the procedure from GRP-CHEM-102. 49 43. Freezing Point Depression - Lab Report Name Any digital Reproduction / Posting outside of Butler Community College domain is a violation of copyright laws and will be subject to legal See Answer. Mass of TBA (g) 4. Question: EXERCISE 12 NAME LAB SECTION DATE Report Trial 3 The Freezing Point Depression Constant of Cyclohexane Trial 1 Trial 2 Data: Mass of test tube and beaker 150053, 150. The mass of the solvent would be increased and the freezing polnut would be lowered. Lab 13 Colligative Properties Lab Report Part B - Determination of the Freezing Point of a Nonelectrolyte, Unknown Solution Unknown number of nonelectrolyte compound Data and observations for Trial 1. 3 1. 9 6. COLLIGATIVE PROPERTIES - FREEZING-POINT DEPRESSION - X 49. 15 DATA Determination 1 Average A. 10 g of a-linolenic acid (molar mass - 278. 7 g 99. S. Temp. Kf = 2. Draw the cooling curve for each run. 20 Solution 1 Solution 2 Solution 3 Potassium chloride КСІ КСІ KCH Molar mass (g/mol) 74. 52139 Mass NaAc initial temp Freezing Temperature 25. 9 174. 0289 9 1. Question: REPORT SHEET EXPERIMENT 15 - Colligative Properties: Freezing-Point Depression and Molar Mass DATA 1. 79 74. Mass of TBA (kg) 5. Attach data sheet with temperature values at each time point obtained from your data 3. Question: Experiment 1: Colligative Properties of Solutions Freezing Point Dopression Enter your data below. The liquid had a density of 0. Report for Experiment 7 Freezing Point Depression and Supercooling Mass of Benzoic Acid used 0. Mass of Test tube/flask and TBA (g) 3. In fact, the more solute particles in solution, the greater the freezing point depression. 202 ATI Use the values of K;= 1. 524 Freezing points 6. 1 Moles of Fill the first 4 salt cups with 1 0 0 mL of ice / water. 5°C - 3. 00°c -0. Respondent base (n=611) among approximately 837K invites. (a) The liquid unknowns for this labhave their densities listed on the labels. Mass of freezing point depression apparatus with lauric acid 8n 519 ang 3. 6029. 2°C -4. Freezing point of solution (From graph)7. Draw best-fit lines (really best fit curves). Question: Experiment 11: Determination of Molar Mass by Freezing Point Depression Introduction When a nonvolatile solute is dissolved in a solvent, the freezing point of the solvent decreases. Be sure to report all values with units and the correct Freezing point depression, AT, for the unknown, nonelectrolyte solution. 00 grams B. 55 74. Kf K f is known as the freezing point depression constant, and depends on the solvent used. In this lab you will first measure the freezing point of pure stearic E153 ⩽ x ∨ f x E153 ⩽ x ∨ f x For each of the unknowns, use the freezing point you determined experimentally and the calculated molality to determine and report their experimental Van't Hoff factor. 3. Experiment I: Colligative Properties Lab Report (28 pts) 1. Mass of glucose6. 84 48. . 790 g/mL The resulting freezing point of the unknown in water was determined to be −4. DETERMINATION OF THE MOLECULAR WEIGHT OF AN UNKNOWN COMPOUND BY FREEZING POINT DEPRESSION EXPERIMENT 2 POST-LAB QUESTIONS: Include a discussion of the following topics in your written report. 8319 Freezing point Trial 2 Freezing point of hexane 7. Name of solute: Acid 6. Prepare a graph of Temperature. 6°C Average freezing Question: EXERCISE 12 NAME LAB SECTION DATE Report The Freezing Point Depression Constant of Cyclohexane Trial 1 Trial 2 Trial 3 Data: Mass of test tube and beaker 150,053, 150. Report the experimental freezing point for deionized water: 3. In an experiment, you use 9. Ky for water is 1. The equation for the freezing point depression of water is: (Equation 13. ) Unknown ID Weight of unknown used Weight of benzophenone used 10. a 10. Report: Lab 3-Freezing Point Depression -RESULTS: Table 1: Freezing Point Depression of Acetic Acid by Addition of Acetamide Results Mass TT (Test Tube, g) Mass TT+Acetic Acid (8) Mass TT+ Acetic Acid + Acetamide Your solution’s ready to go! Our expert help has broken down your problem into an easy-to-learn solution you can count on. Freezing point of solution 8. 4. First, we sought to determine the freezing point depression constant for pure tert-butyl alcohol. 3°C Average - 11. Start Virtual ChemLab, select Colligative Properties, and then select Molar Mass Determination by Freezing Point Depression from the list of assignments. 053, (50. 9 °C A student completed parts A & B of this lab and got the following data for a liquid unknown: Part A: lowest observed temperature in ice- water mixture: 0. See Answer. 08 0. Lab 13 The freezing points of pure substances are unique to each Question: GC 2-4 Freezing Point Depression Study Lab Report-OnlineStudents (1) - Word KATHIE DORELIEN Design Layout References Mailings Review View Help Table Design Layout Part II. 55 Freezing point of solution Mass of Part 2: Freezing Point Depression. You can use this property to calculate the molar mass of an unknown. Weight of succinonitrile 3. So this one is about colligative properties, more specifically depression in freezing point. The boiling point of a solution of 0. Determination of molecular weight for ethylene glycol AT Freezing point °C Mass of solute, mass of solvent, g kg Calculated molecular weight g/mol -1. Mass of freezing point depression apparatus with lauric acid 66. 66 Question: From your graph (see Lab Guide), report the value of the freezing point depression constant, K (°C/m) Try 3: X0 Correct :-2. 6°C Average freezing point of pure cyclohexane Mass of Question: MOLECULAR WEIGHT DETERMINATION BY FREEZING POINT DEPRESSION EXPERIMENT A B) Everything Beauce to be taper = 185. Kr for water is 1. 6864 g Mass ice 79. Report the masses and experimental freezing points for each of the solutions. docx from CH 106 at Butler Community College. 465 g 8 g Mass of test tube & PDB Mass of PDB (by difference) Part 2 - Freezing Point of PDB-Unknown Mixture (~2 g) Mass of vial Here’s the best way to solve it. 0 moles of sodium sulfate dissolved in 1. • To observe and measure the effect of a solute on the freezing point of the solvent. 1514 12. 48 °C AT (Tf pure solvent - Tf solution) °C °C Molality The physical properties of solutions that depend on the number of dissolved solute particles and not their specific type are known as colligative properties. 86 Freezing-point of DI water (∘C) 0. Explanation: Δ T f = K f × m. Sodium Chloride, NaCl Calcium Chloride, CaCl2 Post-Lab Questions 1. 0019 Acetic 3. You can get graph paper from the lab, or print it from a website. 12 °C/m. On the graph, the freezing point depression is represented by ΔTf. • To calculate the molar mass of a View Freezing Point Depression 2. 8°C 122, 12g/mol 30. In this lab we will measure the freezing point of the two solutions created in the first part of the lab and compare them to pure water. Calculate the freezing-point depression Δ T f using the formula Δ T f = i ⋅ K f ⋅ m, where i is the van't Hoff factor, K f is the cryoscopic constant, and m is the molality of the solution. Experiment 15 Freezing Point Depression Note: You will need a watch with a second hand or digital display for this experiment. Move the mouse pointer left to the point where the two regression lines intersect. 92 45. 5229 Time (Minutes) Temperature (°C) Acetic Acid (Stirred) 24. i, where ΔT is the change in freezing point, i is the number of ions in the solution per mole of dissolved NaCl (i = 2), m is the molality of the solution, and Kf is the molal freezing point constant for water which is 1. 6°C grave Mass of cyclohexane Freezing point of pure cyclohexane Average freezing point of pure Question: Report: Lab 3-Freezing Point Depression -RESULTS: Table 1: Freezing Point Depression of Acetic Acid by Addition of Acetamide Results Mass TT (Test Tube, g) Mass TT+Acetic Acid (8) Mass TT+ Acetic Acid + Acetamide (g) Mass Acetic Acid (g) Mass Acetamide (g) Freezing Point Acetic Acid (°C) Freezing Point Solution (°C) At (oC) Molality (m) 5. 2lg 2. Mass of t-butyl alcohol 5. d. The arrow is pointing at the freezing point. To view both sets of temperature data on the same graph, tap Run 2 with the stylus and select All Runs. 053, 150. In discussion part of lab report. A Lab Data - X el Verify your calculation Did you report your data to the correct number of significant figures? 1. 0 0. 3-3. m. Purpose: This experiment illustrates one of the colligative properties of solutions, namely freezing point depression. Pure benzophenone melts at 48. 20 °C -0. Freezing Point Depression - Lab Report Name: DATA Freezing Point of pure water: _0°C_ SALT mass of beaker 60g mass of Here’s the best way to solve it. 2. Record the freezing point in this space. In this experiment you will determine the molar mass of an The freezing point depression is the difference in temperature between the freezing point of the pure solvent and that of the solution. 86 Freezing-point depression constant (*C/m) Freezing point of Dl water ("C) -0. 45°C Freezing point of pure glacial acetic acid Question: COLLIGATIVE PROPERTIES. Measure out each respective amount of salt, using tablespoons and teaspoons. 7532 863 Freezing point of pure cyclohexane Average freezing point of pure cyclohexane3 Mass of naphthalene Freezing point of solution 0:360 0380 Analysis: Freezing-point Question: Lab report: Question 1: Calculate the molar mass of the unknown solid using the freezing point depression formula. 00 g of ice and a coffee cup calorimeter on the lab bench. LERCISE 12 LAB SECTION Report The Freezing Point Depression Constant of Cyclohexane Trial 3 Trial 2 Trial 1 Data: Mass of test tube and beaker Mass of test tube, beaker and cyclohexane Mass of cyclohexane 7H. 84 Sodium chloride Molar mass (g/mol) Mass of calorimeter (9) Molar Mass and Freezing Point Depression EXPERIMENT 1: DETERMINING MOLAR MASS FROM FREEZING POINT Data Sheet Table 1: Freezing Points Solution Freezing Point (C) H2O Glycerol NaCl 0°c - 3. 42oC/m m = 1. 2049 162. 406 420 434 448 462 476 490 504 518 532 546 560 574 588 Freezing-point Our expert help has broken down your problem into an easy-to-learn solution you can count on. 1°C. 308 Freezing point of pure TBA from Graph (C) 21. Freezing point depression is a colligative Question: Lab Report: Freezing Point Depression Freezing Point of Solution with Known Solute NaAc Trial II Trial ! mL Volume Water 100 mL Too Mass water ११. 13 112. Chemistry questions and answers. 1∘C. 1) The freezing point in the first column is: T …. 4871 g 6. Weight of unknown Cooling-curve data: Pure succinonitrile succinonitrile) unknown solution. Give at least two reasonable explanations for this observation. 43 g/mole) is dissolved in 8. •Solution only had 1 cup of water. 1 -6 -6 0. 339 B. Question: Freezing point Depression Date: 2olo Lab Section: Name: Partner'sName: Part I pure TBA 1. 044 66. 2159 _3. Calculate ΔT 1 for water in this experiment ΔT y =T f, water - T f Experiment 3: Determination of Molar Mass by Freezing Point Depression Lab Report Search this course X ADDITIONAL QUESTION If 1. 86 °C/m (for water), m, and AT/ to calculate the van't Hoff ; factor for sucrose Cooling Curve for a Solution 40 3. 825 g Mass of PDB (by difference) Part 2 - Freezing Point of PDB-Unknown Mixture (-2 g) Mass of vial A sample of an unknown liquid having a volume of 39. Identify the change in freezing point by subtracting the freezing point of the pure solvent from the freezing point of the solution. 1 Freezing point of pure benzophenone 40. Freering Point of Pure Benzophenone 1. What is the expected freezing point depression for a solution that contains 2. # PART A: # 1: FREEZING POINT DEPRESSION AFTER ADD …. 7 Time (sec) A student prepares a solution of 3. 1528 g Trial 1: 11. 0538 Mass of test tube, beaker and cyclohexane 162 2044 162. How would your graphs of the freezing point of the solvent alone change ifyou had a drop of water in the test tube before you added the tert-butyl alcohol? Explain. , View the full answer Step 2. 402 g of naphthalene, CiH, in 26. Approximate the freezing point for each graph (the small plateau after the dip in the curve) 3. M. 732 a. Experiment 7: Freezing Point Depression and Supercooling Compare i are the graph for the third trial, Mixture Stime Describe the similarities and the differences with theraph for the first trial, Acetic acid not, 1 What is the freezing point of the acetic acid / benzoic acid mixture as observed in the fourth Suggest ways to improve the accuracy of this experiment. Stir the amount of salt into each cup until the salt dissolves. Experiment 2: Colligative Properties-Freezing Point Depression Post-Lab Questions moles of solute Kq solvent 1. 51a AT-6. Chemical Engineering questions and answers. REPORT SHEET Freezing Point Depression EXPERIMENT 19 A. 9643 CHEM 1412 LAB 2: Freezing Point Depression 10. 3343 g Data Table: Mass of test tube + weighing beaker Mass of glacial acetic acid & test tube + weighing beaker Mass of glacial acetic acid 146. 000 g of solvent (FP = 91. Here’s the best way to solve it. 7°C; Kf = 5. ^ Chegg survey fielded between Sept. 20 Solution 1 Solution 2 Solution 3 NaCl NaCl NaCl 58. This problem has been solved! You'll get a detailed solution from a subject matter expert that helps you learn core concepts. 1) 47- KM where 27, is the freezing point depression Kris the freezing point depression constant for the solvent and Mis the molarity (moles of liter of water) of the solution. Time using the obtained temperature values at each time point Report: report your process, make your analysis, guideline is to make your report repeatable by readers. Mass of freezing point depression apparatus 2. 053, Mass of test tube, beaker and cyclohexane 162. 79 -0. FREEZING-POINT DEPRESSION LADADADADILIZIAN INTRODUCTION Ā Lab Data - - X 1. Mass of benzophenone 100 B 2. 3 Freezing point of mixture Freezing point depression, AT Molality of solution containing unknown Number of moles of unknown used Molecular weight of unknown . 50 g of dichloromethane. 5 Info Next Problem Submit Record the literature value of K(°C/m) for H2O Try 1: 1. Sample Calculations 1. 995 Table 1. vetted by Chegg as specialists in this subject. When a solute is dissolved in a solvent, the freezing temperature is lowered in proportion to the number of moles of solute added. 872 Trial 1: Trial 2: Trial 3: 6. 44 58. Data Sheet - Exp 3 Freezing Point Depression Part 1 Freezing point of hexane Mass of hexane 18. Explain how the following errors would affect the calulcated molecular weight of your unkowns if you were not aware they had occured. Note: 1 teaspoon = 5 mL and 1 tablespoon = 1 5 mL. In this lab, freezing point depression will be investigated. b) THermometer reads 1 C too low along its entire range. 053, 750. OL 4-7: Molar Mass Determination by Freezing Point Depression If you dissolve a substance such as ordinary table salt (NaCl) in water, the freezing point of the water will decrease relative to the freezing point of the pure water. 0 49. 3029. The freezing point depression constant for benzene is 5. Preparation of experimental apparatus and acid aPreparation of experimental apparatus and freezing point determinati freezing point determination of laurie I. 60 Average: Part B: Molal Sep 22, 2021 · The magnitude of the freezing depression produced by a solute is proportional to its colligative molality, mc m c: ΔTf = To f −Tf = Kf ×mc (10. 2049 Mass of cyclohexane Freezing point of pure cyclohexane 7. 42oC/m m = - (-2. 38649 1. 0145 Mass of calorimeter + solution (9) 67. How would your graphs of the freezing point of the solvent alone change if you had a drop of water in the test tube before you added the tert-butyl alcohol? Explain. 9 Mass water + ice 177. 6oC)/2. 1 Freezing point Expert-verified. Lab Report: Determination of Molar Mass by Freezing Point Depression Experimental Data Unknown ID number Part 1 - Freezing Point of Pure PDB Mass of large empty test tube 8. 44 17. There are four colligative properties of solutions, namely, vapor pressure lowering, boiling point elevation, freezing point depression, and osmotic pressure. Experiment 12 Molar Mass by Freezing Point Depression Pre-Lab Study Assignment Section Date: Name: 39. CHEM 1212 Lab Manual 4th Edition 25 REPORT SHEET Part A: Determination of the freezing point of cyclohexane Name of solvent: ass of solvent: Freezing points Trial 1: Trial 2: Trial 3: a ac Average: Part B: Molal freezing point depression constant for cyclohexane Name of solute: P Mass of solute: Freezing points Here’s the best way to solve it. of known solute Weight of known solute Weight of solvent Freezing point of solution Freezing point depression (AT) Molality of solute (m) Question: Experiment 4: Molar Mass by Freezing Point Depression Report SheetData: Unknown number 15Mass of unknownCalculations - work aloneUsing your cooling curve, draw lines on the graph as demonstrated in lab to graphically determine the freezing point of pure cyclohexane. 9 °C Clearly explain your reasoning. unknown Benzene mass-1. 93 Part 2 Freezing point of hexane solution Mass of solute: 0. 2013 162. W. Graph the following data (use graph paper and a ruler). a) Some solvent is lost by evaporation from the unkown solution. 001 g and temperatures to 0. 100 23. (Enter computed values to the correct number of significant figures. Explain any Chemistry questions and answers. Mass of t-butyl alcohol + solute 4. Answer to Solved Pre-Lab Questions: Freezing Point Depression Lab | Chegg. 2 Back to Main Menu - Hunter is currently logged in. Your sample of benzophenone began to freeze at 47. 4 From your graph (see Lab Guide), report the | Chegg. (Report masses to 0. 590 2. At first we calculate the delta T which is depression in freezing point = freezing point of solution - freezing point of solvent = …. Calculate the molar mass of the unknown substance. 0°C °C Trial 1 Trial 3 و وها 1. 97 406 0. Data Sheet - Experiment 3 Freezing Point Depression 2a 417 Part 1 Freezing point of cyclohexane Mass of freezing tube: Mass of freezing tube and cyclohexane:1 023 Mass of cyclohexane 430 Trial Turn in to your Instructor when you have completed the report. 19 Freezing Point Depression A. Freezing point depression, AT, (#2 - #8) 10. Freezing point of solvent 23. 17 g lauric acid, calculate the expected freezing point of the solution. 9 Volume of Dl water (mL) Mass of potassium chloride (9) Moles of potassium chloride (mol) 1. 050 kg Calculation: Mass = Volume x Density Mass = 50 mL x 1 g/mL = 50 g = 0. I'm taking chemistry online and I can never get this part of my lab report correct. What is the freezing point of acetic acid as observed in the first trial, Acetic Acid (Stirred)? 240 2. 86∘C/m. 003g 3. The freezing point of an aqueous sodium chloride solution is –0. wd sh wk ag qw je kp vi ik jx