First slide

Electrolysis

Question

Aqueous solution of ${CuCl}_{2}$ is subjected to electrolysis using Pt electrodes. Then the correct statement is

Difficult

A

$p^{H}$ progressively increases
B

$p^{H}$ progressively decreases
C

$p^{H}$ remains unaffected
D

Cannot be predicted

Solution

${AqCuCl}_{2} is a salt of SA - WB . It' s p^{H} < 7$
On electrolysis At Cathode
Discharge potential of ${Cu}^{+ 2} is less than H_{2} O$
$∴ {Cu}^{+ 2} + 2 e^{-} \to Cu$
At Anode
Discharge potential of ${Cl}^{-} is less than H_{2} O$
$\begin{array}{l} 2 {Cl}^{-} \to {Cl}_{2} + 2 e^{-} \\ ∴ The left over solution will be H_{2} O with p^{H} = 7 \\ p^{H} < 7 changes to P^{H} = 7 \\ p^{H} progressively increases \end{array}$

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