Q. 19

Find the time required to liberate 1.0 liter of hydrogen at STP in an electrolytic cell by a current of 5.0 A.

Answer :


Given
Mass of 1 liter hydrogen,


m=222.4 g


Current = 5A


Let t be required time


Using the formula, from faraday’s law of electrolysis –



where,


m = the mass of the substance deposited on the electrode


z=electrochemical equivalence


i=current passing


t=time taken


substituting the values,





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