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Pure benzophenone melts at 48.1 degrees Celsius. Your sample of benzophenone began to freeze at 47...

Pure benzophenone melts at 48.1 degrees Celsius. Your sample of benzophenone began to freeze at 47 degrees Celsius. When you repeated this measurement, the sample again began to freeze at 47 degrees Celsius. Give at least 2 reasonable explanations for this observation.
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Answer #1
Pure benzophenone has a freezing point of 48.1 C
When it freezes at 47 C, it means the freezing point has been decreased.
This is known as freezing point depression

Two reasons for freezing point depression are:
1. Presence of a soluble substance: When a substance is dissolved in a liquid, the freezing point of the liquid is reduced.
2. Decrease in pressure also causes depression in freezing point in most substances though very large decrease in pressure is necessary.


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