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The freezing point of a solution of KCl in water with a molality of 0.75 m...

The freezing point of a solution of KCl in water with a molality of 0.75 m was experimentally observed to be -2.51 °C. What is the van’t Hoff factor of KCl? The molal freezing-point-depression constant of water is 1.86 (°C·kg)/mol. Hint: The van’t Hoff factor in this case is not a whole number.

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Answer #1

delta Tf = 2.51 oC

Kf = 1.86 oC/molal

molality = 0.75 m

Use:

delta Tf = i*Kf*m

2.51 = i*1.86*0.75

i = 1.80

Answer: 1.80

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