Question

How many minutes will it take to electroplate 29.1g of gold by running 5.00 A of current through a solution of Au+(aq)?

Answer 1

weight = 29.1 g

current (i) = 5 A

F= 96500 C

t= time

Au atomic weight = 197 g/mol

Au+ equivalent weight = atomic weight/charge

                                      = 197/1

                                      =197

Faraday's Law

W = E x i x t/96500

29.1    = 197 x 5 x t/96500

t= 2850.91 sec

t= 47.51min

time required =t= 47.51min ------------------------------(answer)