When determining the gram molecular weight of a substance by a freezing point ex

Question

When determining the gram molecular weight of a substance by a freezing point experiment, tell whether each of the follwing would caused the experimental value of the gram molecular weight to be less than, greater than, or unchanged from the theoretical value. Explain your reasoning in each case.

a.) The thermometer is not properly calibrated and s reading 0.25oC lower than it should over its entire range

b.) Some solvent is lost through evaporation.

c.) the sample is not thoroughly stirred, so some of the unknown solid fails to dissolve.

Explanation / Answer

The answer is (c) the sample is not thoroughly stirred, so some of the unknown solid fails to dissolve.

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