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Chemistry: Principles and Reactions

8th Edition
William L. Masterton + 1 other
Publisher: Cengage Learning
ISBN: 9781305079373

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Chapter
Section
BuyFindarrow_forward

Chemistry: Principles and Reactions

8th Edition
William L. Masterton + 1 other
Publisher: Cengage Learning
ISBN: 9781305079373
Chapter 17, Problem 60QAP
Textbook Problem
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Use Table 17.1 to find Kffor AuCl4- (aq) at 25°C.

Interpretation Introduction

Interpretation: The value of Kf for AuCl4(aq) at 25 C needs to be determined.

Concept introduction: The standard electrode potential of a cell denoted by Eo is the electrode potential of the cell measured under standard conditions in volts. The formation constant also denoted by Kf is the equilibrium constant for the formation of a complex ion from the hydrated ion.

The relation between Eo and Kf of the cell is as follows:

  Ecellο0.0591n×log Kf

Here, n is number of electrons transferred.

Explanation of Solution

The reaction is:

  AuCl4-(aq)+3e-Au(s)+4Cl-(aq)

The half cell reactions for this reaction are as follows:

  Au(s)+4Cl-(aq)AuCl4-(aq)+3e- Eο=-1.001V   -(1)Au3++3e-Au(s)   Eο=1.498V    -(2)

Adding equation (1) and (2) we get,

The reaction becomes

  Au(s)+4Cl-(aq)AuCl4-(aq)

The Eo of the cell becomes:

   Eο=1

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Chapter 17 Solutions

Chemistry: Principles and Reactions
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