The equipment shown above is provided so that the student can determine the value of the molar heat of solution for calcium chloride (CaCl2). Knowing that the specific heat of solution is 4.18 J/(g°C), list the specific measurements that are required to be made during the experiment.

1. Mass of CaCl2 salt in grams

2. Volume of water in calorimeter

3. Mass of water in calorimeter

4. Mass of salt and water solution

5. Initial temperature of water

6. Final temperature of water

7. Temperature difference or change

Explanation:

The amount of heat absorbed or released during a chemical reaction is measured by the process of calorimetry. A calorimeter is a device used for the heat measurements in calorimetry. It consists of an insulated vessel that prevents heat exchange with the environment. The quantity of heat absorbed or released by a chemical reaction is calculated using the following formula: Q = mc∆t

The molar heat of solution, ∆Hsoln, of a substance is the heat absorbed or released when one mole of the substance is dissolved in water. In determining the molar heat of solution of a salt, e.g. calcium chloride, the following measurements are required:

1. Mass of CaCl2 salt in grams

2. Volume of water in calorimeter

3. Mass of water in calorimeter

4. Mass of salt and water solution

5. Initial temperature of water

6. Final temperature of water

7. Temperature difference or change

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