Chapter 23, Problem 36E

Interpretation Introduction

Interpretation:

The time taken by the electric current to pass through a chrome-plating bath should be determined.

Concept introduction:

Faraday’s first law of electrolysis states that in an electrochemical cell, the mass of the substance deposited at any of the electrodes is directly proportional to the amount of electric charge passed through it. The mathematical equation is shown below:

$\begin{array}{l}\text{m}\propto \text{q}\\ \text{m=zq}\\ \text{m=zIt because q=I×t}\end{array}$

Where, m is the mass of the substance deposited.

Z is the constant also known as electrochemical equivalent.

I is the current passes through the solution.

Q is the electrical charge and t is the time taken for the passage of electric current.