Chemistry & Chemical Reactivity

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



Chemistry & Chemical Reactivity

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



  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


Number of moles of NaCl is,


Number of moles of NaCl 0.1mol

Number of moles of KNO3 is,


Number of moles of KNO3 is 0

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