(a) Interpretation: The pH and the hydrogen ion activity of unknown with cell potential of -0.2806 V should be calculated. Concept introduction: pH U = pH S − ( E U − E S ) 0.0592 pH U − pH of the unknown solution pH S − pH of the standard buffer solution E U − cell potential when the electrode is immersed in unknown solution E S − cell potential when the electrode is immersed in the standard buffer solution.

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 23.20QAP
Interpretation Introduction

(a)

Interpretation:

The pH and the hydrogen ion activity of unknown with cell potential of -0.2806 V should be calculated.

Concept introduction:

pHU= pHS(EUES)0.0592

pHU − pH of the unknown solution

pHS − pH of the standard buffer solution

EU − cell potential when the electrode is immersed in unknown solution

ES − cell potential when the electrode is immersed in the standard buffer solution.

Interpretation Introduction

(b)

Interpretation:

The pH and the hydrogen ion activity of unknown with cell potential of -0.2132 V should be calculated.

Concept introduction:

pHU= pHS(EUES)0.0592

pHU − pH of the unknown solution

pHS − pH of the standard buffer solution

EU − cell potential when the electrode is immersed in unknown solution

ES − cell potential when the electrode is immersed in the standard buffer solution.

Interpretation Introduction

(c)

Interpretation:

The range of hydrogen ion activities within which the true value might be expected to lie should be determined.

Concept introduction:

pX = logax=n(EcellK)0.0592

K=EJEref+L

n − number of electrons

K − constant

L − constant

EJ − junction potential

Eref − reference electrode potential

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