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# Temperature Change of Dissolving Salt

**Keywords:**Thermo & Stat Mech, Energy and Entropy, Enthalpy, Specific Heat, Internal Energy

### Highlights of the activity

- Students are placed into small groups and asked to calculate the change in temperature of a cup of water due to the dissolution of NaCl.
- Each group will practice finding the change in temperature of a substance after finding the energy transfer resulting from a thermodynamic process.

### Reasons to spend class time on the activity

This activity provides a solid mathematical computation that introduces the idea that a process such as dissolution results in a transfer of energy. Students are also given the opportunity to analyze how the entropy of water-salt system changes in the dissolution process.

This experiment has never been done, so think of it as no more than an interesting idea at this stage. I didn't have time for it in class, and thus haven't tested it. – David Roundy