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Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

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BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

If you dissolve equal molar amounts of NaCl and CaCl2 in water, the CaCl2 lowers the freezing point of the water almost 1.5 times as much as the NaCl. Why?

Interpretation Introduction

Interpretation: The reason of lowering in the freezing point of water by 1.5 times by the addition of CaCl2 than that of NaCl has to be explained.

Concept introduction:

Colligative properties: Properties of solutions which having influence on the concentration of the solute in it. Colligative properties are,

  • Decrease in the vapor pressure
  • Increase in the boiling point
  • Decline in the freezing point
  • Osmotic pressure

Freezing point depression: The freezing point of the solution varies with the solute concentration.

Freezing point depression = ΔTfp= Kfp. msolute.i,where,Kfp=molal freezing point depression constant,msolute= molality of solute,i=van'tHofffactor.

Explanation

Colligative properties are the properties of solutions which having influence on the concentration of the solute in it. Freezing point of a solution decreases with the increase in concentration of the solute in solution.

When added to water, each CaCl2 get dissociated to 3 ions whereas NaCl get dissociated to 2 ions

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