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 15.1°C. The final temperature of the mixture is 19.8°C. 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 21.3°C to 23.7°C. 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)