Question

Chromium metal can be plated out from an acidic solution containing CrO₃ according to the following equation.

CrO₃(aq) + 6H⁺(aq) + 6e^- → Cr(s) + 3H₂O

Calculate 

(i) How many grams of chromium will be plated out by 24,000 C and 

(ii) How long will it take to plate out 1.5g of chromium by using 12.5A current.

Answer 1

CrO₃(aq) + 6H⁺(aq) + 6e^- → Cr(s) + 3H₂O (AT. wt. = 52)

52g of Cr are deposited by passing electric current of 6 x 96500 C 

(i) In given data 24000 C current are passed, so amount of