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 $0.295g$. Find the equivalent mass of copper. $(1faraday=96500coulomb)$.

• A. $31.75$
• B. $75$
• C. $3175$
• D. $3.175$

Answer 1

The correct option is A $31.75$

Formula$\to W=\xi It$

where W=Mass, I=Current, t=Time, $\xi =ElectrochemicalEquivalent$

$\xi =\frac{EquivalentWeight\left(E\right)}{Faraday\left(F\right)}$.

$\therefore W=\frac{E}{F}\times I\times t$.

$\therefore E=\frac{W\times F}{I\times t}=\frac{0.295\times 96500}{0.25\times 3600}$

$E=31.63$