Quantitative Chemical Analysis
Quantitative Chemical Analysis
9th Edition
ISBN: 9781464135385
Author: Daniel C. Harris
Publisher: W. H. Freeman
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Question
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Chapter 8, Problem 8.AE

(a)

Interpretation Introduction

Interpretation:

The ionic strength of 0.2mMKNO3 has to be calculated.

Concept introduction:

Ionic strength (μ) :

The ionic strength (μ) of the solution is given by

μ=12(c1z12+c2z22+.......)=12icizi2where,ci-concentrationoftheithspeciesandzi-isitscharge.

(a)

Expert Solution
Check Mark

Answer to Problem 8.AE

  • The ionic strength of 0.2mMKNO3 is 0.2mM.

Explanation of Solution

Given information,

0.2mMsolutionofKNO3

Calculate the ionic strength by using the ionic strength calculation formula

μ=12[[K+](+1)2+[NO3-](-1)2]=(12[(0.2)(+1)2+[0.2](-1)2])mM=(12[0.4])mM=0.2mM.

The ionic strength of 0.2mMKNO3 is 0.2mM.

Conclusion

The ionic strength of 0.2mMKNO3 was calculated by using the concentration and charge of the ions.

(b)

Interpretation Introduction

Interpretation:

The ionic strength of 0.2mMCs2CrO4 has to be calculated.

Concept introduction:

Ionic strength (μ) :

The ionic strength (μ) of the solution is given by

μ=12(c1z12+c2z22+.......)=12icizi2where,ci-concentrationoftheithspeciesandzi-isitscharge.

(b)

Expert Solution
Check Mark

Answer to Problem 8.AE

  • The ionic strength of 0.2mMCs2CrO4 is 0.6mM.

Explanation of Solution

Given information,

0.2mMsolutionofCs2CrO4

Calculate the ionic strength by using the ionic strength calculation formula

μ=12[2[Cs+](+1)2+[CrO42-](-2)2]=(12[(0.4)(+1)2+[0.2](-2)2])mM=(12[1.2])mM=0.6mM.

The ionic strength of 0.2mMCs2CrO4 is 0.6mM.

Conclusion

The ionic strength of 0.2mMCs2CrO4 was calculated by using the concentration and charge of the ions.

(c)

Interpretation Introduction

Interpretation:

The ionic strength of 0.2mMMgCl2plus0.3mMAlCl3 has to be calculated.

Concept introduction:

Ionic strength (μ) :

The ionic strength (μ) of the solution is given by

μ=12(c1z12+c2z22+.......)=12icizi2where,ci-concentrationoftheithspeciesandzi-isitscharge.

(c)

Expert Solution
Check Mark

Answer to Problem 8.AE

  • The ionic strength of 0.2mMMgCl2plus0.3mMAlCl3 is 2.4mM.

Explanation of Solution

Given information,

0.2mMMgCl2plus0.3mMAlCl3

Calculate the ionic strength by using the ionic strength calculation formula

μ=12[[Mg2+](+2)2+2[Cl-](-1)2+[Al3+](3)2+3[Cl-](-1)2]=(12[[0.2](+2)2+[0.4](-1)2+[0.3](3)2+[0.9](-1)2])mM=(12[0.8+0.4+2.7+0.9])mM=2.4mM.

The ionic strength of 0.2mMMgCl2plus0.3mMAlCl3 is 2.4mM.

Conclusion

The ionic strength of 0.2mMMgCl2plus0.3mMAlCl3 was calculated by using the concentration and charge of the ions.

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