   Chapter 13, Problem 61GQ

Chapter
Section
Textbook Problem

If you want a solution that is 0.100 m in ions, what mass of Na2SO4 must you dissolve in 125 g of water? (Assume total dissociation of the ionic solid.)

Interpretation Introduction

Interpretation: Mass of Na2SO4 dissolved has to be determined.

Concept introduction:

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

Molarity (M) =Numberofmolesofsolute1literofsolution

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

Numberofmole=GivenmassofthesubstanceMolarmass

Explanation

Given,

Molality of Na2SO4 is 0.001m

Molar mass of Na2SO4 is 142.04g/mol

Mass of water is 125g=0.125kg

Molality of the solution is calculated by the equation,

Molality (m) =NumberofmolesofsoluteMassofsolventinkg

Number of moles of Na2SO4 is,

Number of moles=molality×massofsolvent=0.100m×0.125kg=0

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