Chapter 17, Problem 101E

Interpretation Introduction

Interpretation:

The set up of Hall-Heroult process is given (refer Fig. $17-22$). The amount of current supplied for a given period of time to produce given amount of Aluminum using Hall-Heroult process is to be calculated.

Concept introduction:

The non-spontaneous reaction takes place in an electrolytic cell in which there occurs conversion of electrical energy into chemical energy and this is used for the electrolysis of a metal.

The charge generated in the cell is calculated as,

$\text{Q}\text{=}\text{It}$

When electricity is passed through an electrolytic cell, at that time the amount of the substance that is liberated at an electrode is given by,

$\begin{array}{c}\text{W}\text{=}\text{ZQ}\\ \text{=}\text{ZIt}\end{array}$

The value of $Z$ is given as,

$\text{Z}\text{=}\frac{\text{Molar}\text{mass}}{\text{n}\text{×}\text{96,485}}$

To determine: The amount of current supplied for a given period of time to produce given amount of Aluminum using Hall-Heroult process.