First slide

Electrolysis

Question

When an aqueous solution of lithium chloride is electrolysed using graphite electrodes

Easy

A

pH of the resulting solution decreases
B

pH of the resulting solution increases
C

pH of the resulting solution remains same
D

p^OH of the resulting solution increases.

Solution

Ionization of aq.LiCl :
$LiC{l_{aq}} \rightleftharpoons Li_{aq}^ + + Cl_{aq}^ -$
At Cathode
H₂O is reduced. $2{H_2}O + 2{e^ - } \rightleftharpoons {H_2} + 2O{H^ - }$
At Anode
Cl^- is Oxidised. $2C{l^ - } - 2{e^ - } \rightleftharpoons C{l_2}$
After the electrolysis is over cell is left with LiOH and solution becomes alkaline. P^H increases.

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