1.  Safety
2.
Objectives/Overview
3.
Procedures
4. Observations
5.
Equipment
6.

View Techniques
A. Calibration of Temperature Probe
B. Determination of Heat Capacity
C. Heats of Solutions
D. Temperature Extrapolation from Graph

7.

Waste Disposal/Clean-up

8. Calculations/Set-ups
9. Conclusions
10. Grading Scale
11.
Sample Report Forms
11.
Review Prelab Questions
12. Review Postlab Questions

Experiment 7
Enthalpy of Solution

PRELAB QUESTIONS

References:
Ebbing, "General Chemistry", 5th ed., pp. 228-255 (Thermochemistry)

Learning Center:
SSM Lesson 7; WEN Module 11 (problems 3-10); answers to pre and post-lab questions.

SHOW SET-UP FOR ALL PROBLEMS

1. A student performs a calibration experiment to determine the heat capacity of the calorimeter. The student mixes 25.0 mL of warm water at 41.2 C and 35.0 mL of cool water at 15.1C. The final temperature of the mixture is 19.8C. Assume that the specific heat of water is 4.184 J/g C and that the density of water is 1.00 g/mL. Calculate the heat capacity of the calorimeter.

2. A sample of MgSO4 is dissolved in 50.0 mL of distilled water in a calorimeter with a heat capacity of 35.3 J/g C. The temperature of the solution increased from 21.3C to 23.7C. Calculate the heat released (or absorbed) during this dissolution process.

3. An endothermic reaction involving the dissolution of 1.367 g of compound X in water absorbed 34.6 kJ of heat energy. Calculate the molar enthalpy of solution of compound X. (The molar mass of compound X is 146.32 g/mol)

 
 
 
 
 

 

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