   Chapter 13, Problem 63GQ

Chapter
Section
Textbook Problem

(a) Which solution is expected to have the higher boiling point: 0.20 m KBr or 0.30 m sugar? (b) Which aqueous solution has the lower freezing point: 0.12 m NH4NO3 or 0.10 m Na2CO3?

(a)

Interpretation Introduction

Interpretation: The aqueous solution having higher boiling point among 0.20mKBr and 0.30m 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.

• KBr is completely dissolved and produces 2 ions and hence i=2. So total concentration is 0

(b)

Interpretation Introduction

Interpretation: The aqueous solution having lower freezing point among 0.12mNH4NO3 and 0.01mNa2CO3 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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