Q. One litre solution of MgCl2 is electrolyzed completely by passing a current of 1A for 16 min 5 sec. The original concentration of MgCl2 solution was (Atomic mass of Mg = 24)

Solution:

$m=\frac{EIZ}{96500}=\frac{12\times1\times965}{96500}=12\times10^{-2} g$
$Molarity,\,M=\frac{w_{2}}{M_{2}}\times\frac{1000}{V_{sol}}=\frac{12\times10^{-2}}{24}\times\frac{1000}{1000}=0.5\times10^{-2}=5\times10^{-3} M$

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