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Topic: Zinc freezing point depression  (Read 1137 times)

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Offline ale1998

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Zinc freezing point depression
« on: December 14, 2016, 01:05:55 PM »
Hello,
I did an experiment on how different concentrations of ZnCl2 affect the freezing point of demi water. My results were that till a concentration of about 10 mol dm-3 the freezing point decreased (more or less in a linear manner). After that at concentrations of 15mol dm-3 the freezing point started to increase again (approach 0 degrees Celsius again).

Attached in the file is a graph of the freezing point depression vs. the concentration of ZnCl2 in demi water.
X-axis: concentration of ZnCl2 in mol dm-3
Y-axis: freezing point depression in Kelvin

Does anybody know why the freezing point depression initially decreases, and then past a certain concentration increases again?

Thanks in advance!

Ale1998

Offline mjc123

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Re: Zinc freezing point depression
« Reply #1 on: December 14, 2016, 01:17:16 PM »
Google "eutectic mixture"

Offline Vidya

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Re: Zinc freezing point depression
« Reply #2 on: December 15, 2016, 09:21:42 AM »
Eutectic point or temperature
https://en.wikipedia.org/wiki/Eutectic_system

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