1. In the experiment we determined the freezing point of water to estimate the m
ID: 820942 • Letter: 1
Question
1. In the experiment we determined the freezing point of water to estimate the molecular weight of a volatile organic compound. How will calculations of freezing point depression change if NaCl was used?
2. Could we have used boiling point elevation to determine the molecular weight of the unknowns given to you in the lab? Could you have verified your results by boiling the solution containing the volatile compound ACETONE, (MW 56 g/mol. b.p. also 56 degrees) for instance? Why, or why not? Explain.=.
Really need these explained thoroughly.
Explanation / Answer
1) the depression in freezing point is given by dT= kf * m* i
where i is the vant hoff factor.
the i for any organic volatile compund is 1 and that for NaCl is 2.
so the depression in freezing point will double if naCl is used.
2) yes we can since the molality and the vant hoff factor is known
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