Chapter 13, Problem 101SCQ

### Chemistry & Chemical Reactivity

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

Chapter
Section

### 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

Explanation

Given,

â€‚Â Mass of NaCl is 5.85â€‰g

â€‚Â Mass of KNO3 is 8.88â€‰g

â€‚Â Mass of water is 1000.0â€‰gâ€‰=â€‰1â€‰kg

â€‚Â Molar mass of NaCl is 58.44â€‰g/mol

â€‚Â Molar mass of KNO3 is 101.10â€‰g/mol

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

â€‚Â Numberâ€‰ofâ€‰moleâ€‰=Givenâ€‰massâ€‰ofâ€‰theâ€‰substanceMolarâ€‰massâ€‰

Number of moles of NaCl is,

â€‚Â Numberâ€‰ofâ€‰moleâ€‰=5.85â€‰g58.44â€‰g/molâ€‰=â€‰0.1â€‰mol

Number of moles of NaCl 0.1â€‰mol

Number of moles of KNO3 is,

â€‚Â Numberâ€‰ofâ€‰moleâ€‰=8.88â€‰g101.10â€‰g/molâ€‰=â€‰0.08â€‰mol

Number of moles of KNO3 is 0

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