Freeing and Melting experiment. 1. How does the addition of salt affect the equi

Question

Freeing and Melting experiment.

1. How does the addition of salt affect the equilibrium temperature of the icewater mixture?

2. Was there any difference in the amount of condensation that collected on the outside of each cup? Describe why this occurs, and what it suggests about the temperature of each mixture.

3. Compare the temperatures of the two mixtures over the duration they were in the freezer. Is this what you expect? HINT: what is the coldest temperature either mixture can reach given the freezer temperature?

4. Did either cup completely freeze after 30 minutes? How does the addition of salt appear to affect the freezing point of water?

5. In order to freeze an ice cream mixture, its temperature must be brought below approximately ?3

Explanation / Answer

1.

           Yes. Adding salt to the ice/water mix causes a temperature drop that slows the melting rate and increases the freezing rate. The net result is that the ice melts more and more slowly after the initial addition of salt. In pure water, at 0

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