Metal plating is done by passing current through a metal solution. For example,
ID: 1020148 • Letter: M
Question
Metal plating is done by passing current through a metal solution. For example, an item can become gold plated by attaching the item to a power source and submerging it into a Au3+ solution. The item itself serves as the cathode, at which the Au3+ions are reduced to Au(s). A piece of solid gold is used as the anode and is also connected to the power source, thus completing the circuit.
What mass of gold is produced when 10.1 A of current are passed through a gold solution for 42.0 min ?
Express your answer with the appropriate units.
Explanation / Answer
Au+3 + 3e- --------> Au
z =3
F = 96500C
A = 10.1A
t = 42min = 42*60 = 2520sec
M = 197
W = Mct/ZF
= 197*10.1*2520/3*96500 = 17.32g >>>> answer