   Chapter 13, Problem 101SCQ

Chapter
Section
Textbook Problem

You have two aqueous solutions separated by a semipermeable membrane. One contains 5.85 g of NaCl dissolved in 100. mL of solution, and the other contains 8.88 g of KNO3 dissolved in 100. mL of solution. In which direction will solvent flow: from the NaCl solution to the KNO3 solution, or from KNO3 to NaCl? Explain briefly.

Interpretation Introduction

Interpretation: The direction of flow of solvent is to be identified and explained briefly.

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 boiling point
• Osmotic pressure

Osmosis takes place when solvent molecule passes through a semipermeable membrane from solution having low concentration of solute to solution having high concentration of solute.

The pressure that opposes osmosis is known as osmotic pressure.

Molarity (M): Molarity is number of moles of the solute present in the one liter of the solution.

Molarity (M) =Numberofmolesofsolute1literofsolution

Explanation

Given,

Mass of NaCl is 5.85g

Mass of KNO3 is 8.88g

Mass of water is 1000.0g=1kg

Molar mass of NaCl is 58.44g/mol

Molar mass of KNO3 is 101.10g/mol

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

Numberofmole=GivenmassofthesubstanceMolarmass

Number of moles of NaCl is,

Numberofmole=5.85g58.44g/mol=0.1mol

Number of moles of NaCl 0.1mol

Number of moles of KNO3 is,

Numberofmole=8.88g101.10g/mol=0.08mol

Number of moles of KNO3 is 0

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