Quantitative Chemical Analysis
Quantitative Chemical Analysis
9th Edition
ISBN: 9781464135385
Author: Daniel C. Harris
Publisher: W. H. Freeman
Question
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Chapter 15, Problem 15.20P

a)

Interpretation Introduction

Interpretation:

The junction potential of 0.1MHCl|0.1MKCl is 26.9mV at 250C has to be shown.

Concept Introduction:

Given:

The Henderson junction potential equation between the solutions αandβ are given by

Ej=i|zi|uizi[Ci(β)-Ci(α)]i|zi|ui[Ci(β)-Ci(α)]RTFlni|zi|ui[Ci(α)]i|zi|ui[Ci(β)]

a)

Expert Solution
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Explanation of Solution

In phase α ,

0.1MH+ Has u=36.3×10-8m2s-1V-1

0.1MCl- Has u=7.91×10-8m2s-1V-1

In phase β

0.1MK+ Has u=7.62×10-8m2s-1V-1

0.1MCl- Has u=7.91×10-8m2s-1V-1

Using the Henderson equation substitute the values of phase αandβ .

Ej=(36.3×10-8)[0-0.1]+7.62×10-8[0-0.1]-(7.91×10-8)[0.1-0.1](36.3×10-8)[0-0.1]+7.62×10-8[0-0.1]-(7.91×10-8)[0.1-0.1]×0.05916log(36.3×10-8)[0.1]-(7.91×10-8)[0.1](36.3×10-8)[0.1]-(7.91×10-8)[0.1]=26.9mV

Conclusion

The junction potential of 0.1MHCl|0.1MKCl is 26.9mV at 250C was showed.

b)

Interpretation Introduction

Interpretation:

The junction potential of 0.1MHCl|x MKCl is 26.9mV at 250C where x varies from 1mMto4M has to be plotted.

b)

Expert Solution
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Explanation of Solution

The junction potential of 0.1MHCl|x MKCl values are plotted, where x-axis has junction potential and KCl concentration (M)

Quantitative Chemical Analysis, Chapter 15, Problem 15.20P

Figure 1

Conclusion

The junction potential of 0.1MHCl|x MKCl is 26.9mV at 250C where x varies from 1mMto4M was plotted.

c)

Interpretation Introduction

Interpretation:

The behavior of the junction potential for y MHCl|xMKCl is 26.9mV at 250C has to be shown.

c)

Expert Solution
Check Mark

Explanation of Solution

Given,

The behavior of the junction potential for y MHCl|xMKCl

Where,

y=10-4,10-3,10-2,10-1x=1mMor4M

And values are tabulated as,

                   [HCl]        yMHCl|1mMKCl        yMHCl|4mMKCl
10-4M 9.1 mV 4.6 mV
10-3M 26.9 mV 3.6 mV
10-2M 57.3 mV 3.0 mV
10-1M 93.6 mV 4.7 mV
Conclusion

The behavior of the junction potential for y MHCl|xMKCl is 26.9mV at 250C was showed.

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