(a) Interpretation: The potential of the electrode with respect to a Ag/AgCl(sat’d) reference electrode after addition of different volumes of Cerium(IV) should be calculated. Concept introduction: Nernst equation gives the cell potential under non-standard conditions. E = E 0 − 2.303 R T n F log Q E − cell potential E 0 − standard cell potential R − universal gas constant T − temperature in Kelvin n − number of electrons transferred F − Faraday constant Q − Reaction quotient E c e l l = E c a t h o d e 0 − E a n o d e 0

BuyFind

Principles of Instrumental Analysis

7th Edition
Douglas A. Skoog + 2 others
Publisher: Cengage Learning
ISBN: 9781305577213
BuyFind

Principles of Instrumental Analysis

7th Edition
Douglas A. Skoog + 2 others
Publisher: Cengage Learning
ISBN: 9781305577213

Solutions

Chapter 23, Problem 23.24QAP
Interpretation Introduction

(a)

Interpretation:

The potential of the electrode with respect to a Ag/AgCl(sat’d) reference electrode after addition of different volumes of Cerium(IV) should be calculated.

Concept introduction:

Nernst equation gives the cell potential under non-standard conditions.

E=E02.303RTnFlogQ

E − cell potential

E0 − standard cell potential

R − universal gas constant

T − temperature in Kelvin

n − number of electrons transferred

F − Faraday constant

Q − Reaction quotient

Ecell=Ecathode0Eanode0

Interpretation Introduction

(b)

Interpretation:

A titration curve should be constructed

Concept introduction:

Potentiometric titration is similar to direct redox titrations but in potentiometric titrations no indicator is used. Instead, the potential is measured during the titration to obtain the equivalence point.

Interpretation Introduction

(c)

Interpretation:

A first and second derivative curve for the data should be generated.

Concept introduction:

The first derivative curve of the potentiometric titration is plotted between ΔEΔV and average volume of titrant added. The second derivative curve is plotted between (ΔE/ΔV)ΔV and average volume of titrant added. By generating derivative curved one can obtain the equivalence point accurately.

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