Heat of Solution
The process of dissolving is a process which involves the breaking and making of bonds, and that involves energy.
As a very direct example of the heat involved in a dissolution reaction, I'd like you to try this experiment (which is also described in exercise 16). This can be done either at home or in the lab.
Well, you now know that at least one material has a very exothermic reaction when it dissolves in water.
Next I'd like you to measure the amount of energy involved in such a process. The way to do that is to do the experiment for which instructions are given in exercise 17 in your workbook.
When you do this experiment, use a precision thermometer (one marked in tenths of a degree) for measuring temperature. Check to see if we have temperature probes connected to a computer. If so, you can use that instead. Instructions for using it will be available. You need to write up that experiment as a formal lab report and turn it in. That means writing out the purpose, data, calculations, results, and answering the questions listed.
One additional note: In the phrase "heat of solution," the word "solution" refers to the process of dissolving rather than the physical mixture that is formed.
E-mail instructor: Eden Francis
Clackamas Community College