Chapter 18, Problem 18.78QP

Interpretation Introduction

Interpretation:

The time in hours has to be calculated for the flow of given amount of current.

Concept Introduction:

Faradays First law of electrolysis says that the quantity of substance deposited on an electrode is proportional to the charge passed through the solution.

$\text{m = Z}\times \text{Q}$

Where,

$\text{m}$ is the amount of substance liberated

$\text{Q}$ is the quantity of charge passed

$\text{Z}$ is the electrochemical equivalence of the substance

Faradays second law of electrolysis says that when same amount of electricity is passed through different solutions the amount of substance deposited is proportional to their equivalent weight.

The two laws can be summarised as given below

$\text{m = }\left(\frac{\text{Q}}{\text{F}}\right)\left(\frac{\text{M}}{\text{z}}\right)$

Where

$\text{m}$ is the amount of substance liberated

$\text{Q}$ is the quantity of charge passed

$\text{F}$ is Faraday Constant $(96500{\text{Cmol}}^{\text{-1}})$

$\text{M}$ is the molar mass of the substance

$\text{z}$ is the valancy of the substance