Question

In an experiment, 295 mg of copper is deposited when a current of 500 mA passes for 30 minutes. Find the electrochemical equivalent of copper1

Answer 1

32.77 a 10-8 kg/ coulomb

Answer 2

Answer: The electrochemical equivalent of copper is 0.32 mg.

Explanation:  Electrochemical equivalent of a substance is the weight deposited by 1 coloumb of electricity.

$Q= I\times t$

where Q= quantity of electricity in coloumbs

I = current in amperes = 500 mA= 0.5 A

t= time in seconds = 30 minutes =$30\times 60=1800sec$

$Q=0.5A\times 1800s=900C$

$Cu^{2+}+2e^{-1}\rightarrow Cu$

Given:- 900C of electricity deposits 295 mg of  Cu.

1 C of electricity deposits=$\frac{295}{900}\times 1=0.32mg$ of  Cu.