Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Question
How do I calcluate the mass of water in the final solution
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Week 2- Colligative Properties Lab
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K CHEMISTRY • DETERMINE VAN'T HOFE FACTOR
SUBMIT
INTRODUCTION
LABORATORY SIMULATION
A Lab Data
PHASE 5:
Measure freezing-point of
solution 1
Verify your mass calculation
Verify that the mass of water is in kilograms
Did you account for the freezing-point of your DI water?
Did you report your data to the correct number of significant figures?
Complete the following steps:
Click on the section of the graph that
indicates the freezing-point of
solution 1. Record freezing-point in
Potassium chloride
KCI
KCI
KCI
Molar mass (g/mol)
74.55
74.55
74.55
Lab Data
Mass of calorimeter (g)
17.28
Wash/Waste
Zoom out. Remove temperature
Volume of DI water (mL)
48.6
probe. Place calorimeter over sink
and decant solution
Mass of potassium chloride (g)
1.08
Moles of potassium chloride (mol)
0.0145
0.00 g
Weigh calorimeter and remaining ice
on balance. Record mass in Lab
DI
Mass of calorimeter + solution (g)
67.13
TARE
Data
Mass of calorimeter + solution + ice (g)
112.79
Freezing-point of solution (°c)
-0.89
Place used calorimeter in
Wash/Waste bin
Mass of calorimeter + ice after decanting (g)
43.92
Mass of ice added (g)
45.66
Calculate following and record in Lab
Data
Mass of ice remaining after decanting (g)
26.64
• Mass of ice added
• Mass of ice remaining
• Mass of melted ice
• Mass of water in solution (in
grams and kilograms)
• Molality
• Freezing-point depression
Mass of melted ice (g)
19.02
Mass of water in final solution (g)
Mass of water in final solution (kg)
Molality of solution (m)
Freezing-point depression (°C)
GO TO PHASE 6
van't Hoff factor
PHASES
5
11
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