Question

In: Chemistry

Decide whether or not each metal dissolves in 1 molL?1HCl(aq). Reduction Half-Reaction E?(V) Al3+(aq)+3e? ?Al(s) -1.66...

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.

Expert Solution

If the reduction potential of metal ion is negative when compared to the reduction potential of Hydrogen (0) then the metal will dissolve

Here,

Reduction potential of Al³⁺ = -1.66 V. Therefore, Al³⁺ will dissolve

Reduction potential of Mg²⁺ = -2.37 V. Therefore, Mg²⁺ will dissolve

Reduction potential of Ag⁺ = 0.80 V. Therefore, Ag⁺ will not dissolve

Reduction potential of Au³⁺ = 1.50 V. Therefore, Au³⁺ will not dissolve

Reduction potential of Pb²⁺ = -0.13 V. Therefore, Pb²⁺ will dissolve

Reduction potential of Cd²⁺ = -0.40 V. Therefore, Cd²⁺ will dissolve

a)

2 Al (s) + 6 H⁺(aq) 2 Al³⁺ (aq) + 3H₂ (g)

b)

Pb (s) + 2 H⁺ (aq) Pb²⁺ (aq) + H₂ (g)

queen_honey_blossom answered 2 years ago

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