The expected freezing point of C a C l 2 is to be determined. 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 Decline in the freezing point is huge when solute is an electrolyte than when solute is nonelectrolyte. Therefore, change in freezing point is calculated by using the equation, Δ T f p = K f p m s o l u t e i where, K f p is the molal freezing point depression constant. i is van’t Hoff factor van’t Hoff factor, i: it is the ration between change in in freezing point measured and change in in freezing point calculated. It indicates the total number of ions that are produced. The number of moles of any substance can be determined using the equation Number of mole = Given mass of the substance Molar mass Molality (m): Molality is the number of moles of solute present in one kilogram of solvent. Molality (m) = Number of moles of solute 1kg of solvent

BuyFind

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781337399074
BuyFind

Chemistry & Chemical Reactivity

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

Solutions

Chapter 13, Problem 65GQ
Interpretation Introduction

Interpretation: The expected freezing point of CaCl2 is to be determined.

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

Decline in the freezing point is huge when solute is an electrolyte than when solute is nonelectrolyte. Therefore, change in freezing point is calculated by using the equation,

  ΔTfp=Kfpmsolutei

  where,

  Kfp is the molal freezing point depression constant.

  i is van’t Hoff factor

van’t Hoff factor, i: it is the ration between change in in freezing point measured and change in in freezing point calculated. It indicates the total number of ions that are produced.

The number of moles of any substance can be determined using the equation

  Numberofmole=GivenmassofthesubstanceMolarmass

Molality (m): Molality is the number of moles of solute present in one kilogram of solvent.

  Molality (m) =Numberofmolesofsolute1kgofsolvent

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