First slide

Faraday's Laws

Question

How long will it take to produce 1 kg of Cl₂ from 20 Lit of 20% by weight NaCl aqueous solution by passing 25 A current with 62% current efficiency is passed.

Difficult

A

48.72 hr
B

4.872 hr
C

48.72 s
D

48.72 min

Solution

$1 kg {Cl}_{2} = \frac{1000}{35 .5} equivalentof {Cl}_{2} = 28 .17 equivalentof {Cl}_{2}$
Theoretical electricity required - 28.17 F
Efficiency is 62%
Electricity required (experimental) $= \frac{28 .17 \times 100 F}{62} = 45 .44 F$
$\Rightarrow 45 .44 \times 96500 = 25 t; t = 48 .72 hr$

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