Chapter 23, Problem 35E

Interpretation Introduction

Interpretation:

The amount of chromium that will be deposited on an object in a chrome-plating bath needs to be determined.

Concept introduction:

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

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

Here,

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.