Explanation The expression of net limiting current for the solution containing Cd 2 + is: i 1 = k ( c Cd 2 + ) ........ (I) Here, the concentration of the reactant Cd 2 + is c Cd 2 + and the constant for reactant Cd 2 + is k . The expression of net produced current is: i 2 = k ( c Cd 2 + ) 1 ........ (II) Here, the concentration of Cd 2 + when some amount of Cd 2 + is added is ( c Cd 2 + ) 1 . The expression of concentration of Cd 2 + when some amount of Cd 2 + is added is: ( c Cd 2 + ) 1 = V std ( c Cd 2 + ) + V added ( c Cd 2 + ) added V std + V added ........ (III) Here, the standard volume is V std , the added volume is V added and the added concentration is ( c Cd 2 + ) added . Substitute 1.41 μA for i 1 in Equation (I). 1.41 μA = k ( c Cd 2 + ) k = 1.41 μA ( c Cd 2 + ) Substitute 25 ml for V std , 5 ml for V added and 2.50 × 10 − 3 M for ( c Cd 2 + ) added in Equation (III). ( c Cd 2 + ) 1 = ( 25 ml ) ( c Cd 2 + ) + ( 5 ml ) ( 2

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ISBN: 9781305577213

Author: Douglas A. Skoog, F. James Holler, Stanley R. Crouch

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Question

Chapter 25, Problem 25.13QAP

Interpretation Introduction

Interpretation:

The concentration of Cd2+ should be determined.

Concept introduction:

The method of adding standard in the aliquots of analyzed sample directly is called standard addition method. The standard addition method is a type of quantitative analysis approach of adding standard in the sample.

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Chapter 25 Solutions

Principles of Instrumental Analysis

Ch. 25 - Prob. 25.1QAP Ch. 25 - Prob. 25.2QAP Ch. 25 - Prob. 25.3QAP Ch. 25 - Prob. 25.4QAP Ch. 25 - Prob. 25.5QAP Ch. 25 - Prob. 25.6QAP Ch. 25 - Prob. 25.7QAP Ch. 25 - Prob. 25.8QAP Ch. 25 - Prob. 25.9QAP Ch. 25 - Quinone undergoes a reversible reduction at a...

Ch. 25 - Prob. 25.11QAP Ch. 25 - Prob. 25.12QAP Ch. 25 - Prob. 25.13QAP Ch. 25 - Prob. 25.14QAP Ch. 25 - Prob. 25.15QAP Ch. 25 - Prob. 25.16QAP Ch. 25 - Prob. 25.17QAP

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