Question

# The mass of copper deposited from a solution of copper sulphate by a uniform current of $$0.25$$ ampere flowing for one hour is $$0.295\ g$$. Find the equivalent mass of copper. $$(1\ faraday = 96500 coulomb)$$.

A
31.75
B
75
C
3175
D
3.175

Solution

## The correct option is A $$31.75$$Formula$$\rightarrow W=\xi It$$where W=Mass, I=Current, t=Time, $$\xi=Electrochemical \,Equivalent$$$$\xi=\cfrac{Equivalent \,Weight(E)}{Faraday(F)}$$.$$\therefore\,W=\cfrac{E}{F}\times I\times\,t$$.$$\therefore\,E=\cfrac{W\times \,F}{I\times\,t}=\cfrac{0.295\times 96500}{0.25\times 3600}$$$$E=31.63$$Chemistry

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