116 LABORATORY EXPERIMENTS IN GENERAL CHEMISTRY 6. A pure liquid, Q, freezes at

Question

116 LABORATORY EXPERIMENTS IN GENERAL CHEMISTRY 6. A pure liquid, Q, freezes at 10.0 C. Consider adding a small amount of each of the following substances to the liquid. State what effect each substance would have on the freezing point of liquid Q and give a reason for your answer a) substance A is soluble in Q and has a lower freezing point than Q b) substance B is soluble in Q and has the same freezing point as Q c) substance C is soluble in Q and has a higher freezing point than Q d) substance D is soluble in Q and has the same freezing point depression constant as Q e) substance E is insoluble in Q and has a lower freezing point than Q f) substance F is identical in all respects to liquid Q ntant of 1 86 C-kg/mol. What mass of

Explanation / Answer

change in freezing point occur due to colligative propertis

a

this solution now freez between 10°C to less than 10°C

b

tthis solution now freez at 10°C liq Q remain unaffected

c

this solusoluntiosoluntion nnow frfreez between 10°C to higher than 10°C

d

this solution freez at 10°C no effect on liquid Q

e

liquid Q freez at 10 C no effect because no interaction of molecules take place

f

Liqued Q freezing point remain same due to equal rate of Crystallization

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