Problem 11.125 Many acids are partially dissociated into ions in aqueous solutio

Question

Problem 11.125

Many acids are partially dissociated into ions in aqueous solution. Trichloroacetic acid (CCl3CO2H), for instance, is partially dissociated in water according to the equation
CCl3CO2H(aq)H+(aq)+CCl3CO2(aq)

Part A

What is the percentage of molecules dissociated if the freezing point of a 1.00 msolution of trichloroacetic acid in water is -2.53 C?

Express your answer using two significant figures.

Problem 11.125

Many acids are partially dissociated into ions in aqueous solution. Trichloroacetic acid (CCl3CO2H), for instance, is partially dissociated in water according to the equation
CCl3CO2H(aq)H+(aq)+CCl3CO2(aq)

Part A

What is the percentage of molecules dissociated if the freezing point of a 1.00 msolution of trichloroacetic acid in water is -2.53 C?

Express your answer using two significant figures.

Explanation / Answer

Apply Colligative Properties

dTf = -Kf*m*i

m = mol of S / kg solvent= 1

i = dTf/Kf/m

i = (-2.53)/(-1.86)/(1)

i = 1.36

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