First slide

Electrolysis

Question

During the electrolysis of aqueous solution of the following, molarity of the solution increases without changing the chemical composition

Easy

A

NaCl
B

HCl
C

CuSO₄
D

H₂SO₄

Solution

Electrolysis of aq NaCl
Products are H_{2 ,}Cl₂ and NaOH. Composition is changed.
Electrolysis of aq HCl
At Cathode
$2{H_2}O \rightleftharpoons {H_2} + 2O{H^ - } - 2{e^ - }$
At Anode
$2C{l^ - } - 2{e^ - } \rightleftharpoons C{l_2}$
Cell is left with H₂O. Composition changed.
Electrolysis of aq CuSO₄
At Cathode
$C{u^{ + 2}} + 2{e^ - } \rightleftharpoons Cu$
At Anode
$2{H_2}O \rightleftharpoons {O_2} + 4{H^ + } + 4{e^ - }$
Cell is left with H₂SO_4.Composition is changed.
Electrolysis of aq.H₂SO₄
At Cathode
$2{H_2}O \rightleftharpoons {H_2} + 2O{H^ - } - 2{e^ - }$
At Anode
$2{H_2}O \rightleftharpoons {O_2} + 4{H^ + } + 4{e^ - }$
Left over in the vessel is H₂SO₄.Composition remains same.Solution becomes more concentrated molarity increases.

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