Chapter 13, Problem 11PS

### 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

# The average lithium ion concentration in seawater is 0.18 ppm. What is the molality of Li+ in seawater?

Interpretation Introduction

Interpretation: The molality of Li+ in sea water to be identified.

Concept introduction:

Molality: The amount of solute (mol) per kilogram of solvent.

Concentration (C, mol/kg) =  molality of solute = Amount of solute (mol)Mass of solvent (Kg)

Explanation

Given data:

1â€‰ppmâ€‰=â€‰1â€‰mg/kg,0.18Â ppmÂ =Â 0.18Â mg/kgÂ =Â 0.18Â Ã—10-3g/kgâ€‰=Â 0.18Â Ã—10-3g/Lâ€‰(massâ€‰ofâ€‰lithiumâ€‰ionsâ€‰inâ€‰1Lâ€‰ofâ€‰water).

The molality:

Molality of a solute is defined as the amount of solute dissolves in kilogram of solvent.

Molalityâ€‰=â€‰molesâ€‰ofâ€‰soluteMassâ€‰ofâ€‰solventâ€‰inâ€‰kg

No.â€‰ofâ€‰molesâ€‰=â€‰massmolarâ€‰mass

MolesÂ â€‰=Â massÂ ofÂ lithiumMolarâ€‰massÂ ofÂ lithiumâ€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰=0

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