Question

Reduction Half-Reaction		E∘(V)
Al3+(aq)+3e−	→Al(s)	-1.66
Mg2+(aq)+2e−	→Mg(s)	-2.37
Ag+(aq)+e−	→Ag(s)	0.80
Au3+(aq)+3e−	→Au(s)	1.50
Pb2+(aq)+2e−	→Pb(s)	-0.13
Cd2+(aq)+2e−	→Cd(s)	-0.40

Decide whether or not each metal dissolves in 1 molL−1HCl(aq).

1. Write a balanced redox reaction showing what happens when Al dissolves.

2. Write a balanced redox reaction showing what happens when Cd dissolves.