Exercise for Balancing Redox Equations in Base Using the Half-reaction Method

Exercise

Exercise - Balance the following redox equations for reactions run in basic conditions. (The answers are at the bottom of this page.)

a. CrO₄²^-(aq) + S²^-(aq) --> Cr(OH)₃(s) + S(s)

b. MnO₄^-(aq) + I^-(aq) --> MnO₂(s) + IO₃^-(aq)

c. H₂O₂(aq) + ClO₄^-(aq) --> O₂(g) + ClO₂^-(aq)

d. S²^-(aq) + I₂(s) --> SO₄²^-(aq) + I^-(aq)

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Answers

a. 2CrO₄²^-(aq) + 3S²^-(aq) + 8H₂O(l)
--> 2Cr(OH)₃(s) + 3S(s) + 10 OH^-(aq)

b. 2MnO₄^-(aq) + I^-(aq) + H₂O(l)
--> 2MnO₂(s) + IO₃^-(aq) + 2OH^-(aq)

c. 2H₂O₂(aq) + ClO₄^-(aq) --> 2O₂(g) + ClO₂^-(aq) + 2H₂O(l)

d. S²^-(aq) + 4I₂(s) + 8OH^-(aq) --> SO₄²^-(aq) + 8I^-(aq) + 4H₂O(l)