Balance the following redox reaction in basic solution.

Question

Complete and balance the following redox reaction in basic solution. Be sure to include the proper phases for all species within the reaction. NO₃⁻(aq) + AsH₃(s) → NH₃(g) + As(s)

Answer 1

NO₃^-(aq) + AsH₃(s) ==> NH₃(g) + As(s) .. unbalanced equation

NO₃^-(aq) ==> NH₃(g) .. unbalanced reduction reaction (N goes from +5 to -3)

NO₃^-(aq) ==> NH₃(g) + 3H2O(l) .. balanced for N and O

NO₃^-(aq) + 9H2O(l) ==> NH₃(g) + 3H2O(l) + 9OH^-(aq) .. balanced for N, O and H (using base, OH-)

NO₃^-(aq) + 9H2O(l) + 8e- ==> NH₃(g) + 3H2O(l) + 9OH^-(aq) .. balance for N, O, H and charge

AsH₃(s) ==> As(s) .. unbalanced oxidation reaction (As goes from -3 to zero)

AsH₃(s) ==> As(s) + 1.5 H2O(l) .. balanced for As and H

2AsH₃(s) + 6OH^-(aq) ==> 2As(s) + 6H2O(l) .. balanced form As, H and O (using base, OH-)

2AsH₃(s) + 6OH^-(aq) ==> 2As(s) + 6H2O(l) + 6e- .. balanced for As, H, O and charge

3NO₃^-(aq) + 27H2O(l) + 24e- ==> 3NH₃(g) + 9H2O(l) + 27OH^-(aq)

8AsH₃(s) + 24OH^-(aq) ==> 8As(s) + 24H2O(l) + 24e-

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3NO₃^-(aq) + 3H2O(l) + 8AsH₃(s) ==> 3NH₃(g) + 9H2O(l) + 3OH^-(aq) + 8As(s) .. BALANCED REDOX