6. Chemical Quantities & Aqueous Reactions

Which is an important step in the alternate method for balancing equations in redox reactions?

What is the coefficient of Fe³⁺ when the following reaction is balanced?

Bi³⁺ (aq) + Fe³⁺ (aq) + H₂O (l) → BiO₃^- (aq) + Fe²⁺ (aq) + H⁺ (aq)

2 H₃PO₄ (aq) + 3 Ba(OH)₂ (aq) → Ba₃(PO₄)₂ (s) + 6 H₂O (l)

2 H₃PO₄ (aq) + 3 Ba(OH)₂ (aq) → Ba₃(PO₄)₂ (s) + 6 H₂O (l)

Balance the following redox reaction in an acidic solution.

Cl₂ (g) + S₂O₃^2- (aq) → Cl^- (aq) + SO₄^2- (aq)

Write a balanced overall reaction from these unbalanced half-reactions. Cu ⟶ Cu²⁺ Ag⁺ ⟶ Ag