What is the difference between the melting and freezing point of a substance? Also, what do freezing point and melting point of a substance have in common?

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Deanna HettingerLv2

13 Dec 2019

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1. What effect does an impurity have on the melting point (freezing point) of a pure substance? a) How can this applied to icy conditions on roads? b) Is it better to use salt or gravel on icy roads? c) What effect does antifreeze have on the freezing point of water in a car's radiator?

Freezing Point Depression Lab

Objective: To use freezing point to determine the molecular weight of an unknown substance.

In this lab, we used benzophene as the solvent, which has a freezing point of 48.1 degrees celsius and Kf value of 9.80 degrees C/m. The procedure consisted of measuring out 10 g benzophenone in a test tube and melting the substance in a warm water bath. When melted, we removed the test tube from the bath and allowed it to cool. We observed the freezing point. Next, we added half a gram of an unknown substance to the test tube and melted the soultion once more. We observed the freezing point.

My question is the following: How would the experiment be different if we had used water as the solvent? Explain what you would have to change to account for this difference and how you would do it.

what does the melting point and freezing point have in common

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What is the difference between the melting and freezing point of a substance? Also, what do freezing point and melting point of a substance have in common?

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