The freezing points of a solution of nitrobenzene alone and of nitrobenzene plus

Question

The freezing points of a solution of nitrobenzene alone and of nitrobenzene plus an nonionic unknown were measured
Using the graph of temperature vs. time, answer the following questions. (answer a in the first blank, b in the second, etc)
a) What is the freezing point of the nitrobenzene?
b) What is the freezing point of the nitrobenzene + unknown?
c) What is the freezing point depression, ?Tf? Time, nitrobenzene nitrobenzene+Unk min temp temp 0.0 12.50 0.5 10.75 1.0 8.75 1.5 6.50 2.0 4.80 2.5 4.50 3.0 4.25 4.0 4.50 14.00 9.00 8.00 7.00 1200 5.00 1.00 3.75 1.00 13.00 10.00 .00 1.25 8.00 m 5.0 .00 6.0 5.30 7.0 8.0 5.30 9.0 5.30 -2.25 -2.50 00 5.00 4,00 .. 5.30 1.80 -1.503.00 10.0 .30 11.0 5.20 12.0 5.20 13.0 5.20 14.0 5.20 15.0 5.20 16.05.20 1.75 1.80 200 1.00 0.00 s.0 2.00 2.10 2.20 100 -2.00 -3.00

Explanation / Answer

a) The freezing point of nitrobenzene is 5.3ºC.

b) The freezing point of nitrobenzene + unknown is -1.5ºC

c) The freezing point depression is:

Tf= Tfº-Tf= (5.3-(-1.5))ºC= 6.8ºC

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