Decide whether or not each metal dissolves in 1 molL?1HCl(aq). Reduction Half-Re

ID: 492296 • Letter: D

Question

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

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

Express your answer as a chemical equation. Identify all of the phases in your answer.

b) Write a balanced redox reaction showing what happens when Pb dissolves.

Express your answer as a chemical equation. Identify all of the phases in your answer.

Al3+(aq)+3e Al(s) -1.66 (yes . it will dissolve)

Mg2+(aq)+2e Mg(s) -2.37 (yes . it will dissolve)

Ag+(aq)+e Ag(s) 0.80 (no . it wont dissolve)

Au3+(aq)+3e Au(s) 1.50 (no . it wont dissolve)

Pb2+(aq)+2e Pb(s) -0.13 (yes . it will dissolve)

Cd2+(aq)+2e Cd(s) -0.40 (yes . it will dissolve)

2 Al (s) + 6 HCl (aq)-----------------------------> 2 AlCl3 (aq) + 3 H2 (g)

hydrogen gas will relases

Pb (s) + 2 HCl (aq)-----------------------------> PbCl2 (aq) + H2 (g)

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