Question

What current is needed to deposit 0.5 g cr from a solution of cr3+ for 1hour

Answer 1

Answer:

From Faraday's law of electrolysis, 

m=Fit×zM

m= mass of the substance liberated at an electrode in grams = 1g

I= total electric current passed through the substance=1.25A

F= 96485 C mol−1 is the Faraday constant

M= molar mass of the substance=52

z= valency number of ions of the substance (electrons transferred per ion)=3

So, thetotal time required will be t=M×imFz=52×1.251×96500×3=4453.84 sec=1.24 hr

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