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An aqueous solution of copper sulphate, ...

An aqueous solution of copper sulphate, `CuSO_(4)` was electrolysed between platinum electrodes using a current of 0.1287 A for 50 min.
[ Given atomic mass of Cu = 63. 5 g `"mol"^(-1)` ]
( i) Write the cathodic reaction.
(ii ) Calculate
(a) electric charge passed during electrolysis.
(b) mass of copper deposited at the cathode.
[ Given, 1 F = 96500 C `" mol"^(-1)` ]

Text Solution

Verified by Experts

Given that, t = 50 `xx 60 = 3000s, i = 0.287A`,
(i) `Cu^(2+) + 2 e^(-) rarr Cu(s)`
(ii) ( a) `Q = it = 0.1287 xx 3000 = 386.1 C`
(b) `m = Z xx i xx t = (" Eq. wt. ")/( 96500) xx i xx t `
`= ( 63.5 )/( 2 xx 96500 ) xx 386.1 = 0.127 g `
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