Colligative Property LAB WORK PDF

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Summary

McGraw-Hill Laboratory Work...

Description

2/25/2021

Laboratory Simulation

Phases Complete 10 of 10 phases.

Phase Resets Phase Phase Phase Phase Phase Phase Phase Phase Phase Phase

1: 0 2: 0 3: 0 4: 0 5: 0 6: 0 7: 0 8: 0 9: 1 10: 1

Popup Questions Why is your measured freezing-point of water not exactly 0.00 ℃? Choose the single best answer. Incorrect Attempts: 0

Questions Which of the following factors affect the freezing-point depression of a solution? Select all that apply. Molality of the solution Molal freezing-point depression constant van’t Hoff factor of the solute

A student collected the following data when measuring the freezing-point of an aqueous solution. What is the freezing-point of the solution?

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Laboratory Simulation

Cooling curve from 0 to 300 seconds

Cooling curve expanded from 85 to 145 seconds

-1.0°C

Collected Lab Data Freezing-point depression constant (°C/m)

1.86

Freezing-point of DI water (°C)

0.10

Solution 1

Solution 2

Solution 3

Molar mass (g/mol)

180.16

180.16

180.16

Mass of calorimeter (g)

17.22

17.45

17.33

Volume of DI water (mL)

47.3

48.1

49.1

1.97

4.06

5.41

0.0109

0.0225

0.0300

Mass of calorimeter + solution (g)

66.51

69.69

71.85

Mass of calorimeter + solution + ice (g)

110.84

115.87

116.86

Freezing-point of solution (°C)

-0.19

-0.41

-0.60

Mass of calorimeter + ice after decanting (g)

39.88

30.37

31.62

Mass of ice added (g)

44.33

46.18

45.01

Mass of ice remaining after decanting (g)

22.66

12.92

14.29

Glucose

Mass of glucose (g) Moles of glucose (mol)

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Laboratory Simulation

Solution 1

Solution 2

Solution 3

Mass of melted ice (g)

21.67

33.26

30.72

Mass of water in final solution (g)

68.99

81.44

79.83

Mass of water in final solution (kg)

0.06899

0.08144

0.07983

Molality of solution ( m)

0.158

0.277

0.376

Freezing-point depression (°C)

0.29

0.51

0.70

van’t Hoff factor

1.00

Saved Graphs Graph 1 Freezing-point depression (°C)

Linear regression: y = 1.86x

Molality of solution (m)

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