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100mL CuSO(4) (aq) was electrolyzed usin...

`100mL CuSO_(4)` (aq) was electrolyzed using inert electrodes by passing `0.965A` till the pH of the resulting solution was 1. the soluton after electrolysis was neutralized treated with excess `KI` and titrated with `0.04M Na_(2)S_(2)O_(3)`. Volume of `Na_(2)S_(2)O_(3)` required was 35mL. Assuming no volume change during electrolysis calculate:
(a) during of electrolysis if current efficiency is `80%`
(b) initial concentration `(M)` of `CuSO_(4)`.

A

`112.5ml`

B

`100ml`

C

`125ml`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
A
Initial `m`. Mole of `Cu^(2+)=5`
`m`. Mole of `H^(+)` produced `=1`
`m`. Mole of `Cu^(2+)` converted to `Cu=1/2=0.5`
`m`. Mole of `Cu^(2+)` remaining in solution `=5-0.5=4.5`
`2Cu^(2+)+4l^(-)toCu_(2)l_(2)+l_(2)`
`l_(2)+2Na_(2)S_(2)O_(3)to2Nal+Na_(2)S_(4)O_(6)`
`4.5=0.04xxV`
`V=112.5` mol
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