Metal plating is done by passing current through a metal solution. For example,

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.

QUESTION

What mass of gold is produced when 16.0 A of current are passed through a gold solution for 32.0 min ?

Explanation / Answer

Total C = I*t = 16*32*60 = 30720 C

mol of e- = 30720/96500 = 0.3183419 mol of e-

1 mol of Au+3 requires 3 mol of e-

so

mol o Fau = 1/3*0.3183419 = 0.1061139 mol of Au

mass = mol*MW = 0.1061139*196.96657 = 20.9008 g of Au

Related Questions

Navigate

• Browse (All)
• Browse M
• Subjects