   Chapter 13, Problem 54GQ

Chapter
Section
Textbook Problem

(a) Which aqueous solution is expected to have the higher boiling point: 0.10 m Na2SO4 or 0.15 m sugar? (b) For which aqueous solution is the vapor pressure of water higher: 0.30 m NH4NO3 or 0.15 m Na2SO4?

(a)

Interpretation Introduction

Interpretation: The aqueous solution having higher boiling point among 0.10mNa2SO4 and 0.15m sugar has 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

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.

Explanation

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

Boiling point of a solution increases with the increase in concentration of the solute in solution.

• Sugar is a non-electrolyte and hence i=1. So total concentration is 0.15m
• Na2SO4 is completely dissolved and produces 3 ions and hence i=3

(b)

Interpretation Introduction

Interpretation: The aqueous solution having higher vapor pressure among 0.30mNH4NO3 and 0.15mNa2SO4 has 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

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.

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