Write balanced equations for the following oxidation-reduction reactions, which
ID: 977012 • Letter: W
Question
Write balanced equations for the following oxidation-reduction reactions, which occur in basic solution, using the half-reaction method. Use H+ and H2O in the half-reactions but not in the equation for the overall reaction, which occurs in basic solution. Use the lowest possible coefficients. Include states-of-matter under the given conditions in your answer.
(a) Al(s) + MnO4(aq) MnO2(s) + Al(OH)4(aq)
oxidation half reaction
reduction half reaction
complete balanced reaction
(c) NO2(aq) + Al(s) NH3(g) + AlO2(aq)
oxidation half reaction
reduction half reaction
complete balanced reaction
Explanation / Answer
a)
Oxidation Half
Al(s) + 4H2O ------------- Al(OH)4-(aq) + 4H+ + 3e-
Reduction Half
MnO4-(aq) -+ 4H+ + 3e- --------------- MnO2(s) + 2H2O(l)
Complete Balanced Reaction
MnO4-(aq) + Al(s) + 2H2O(l) ------------ MnO2(s) + Al(OH)4-(aq)
c)
Oxidation Half
Al(s) + 2H2O ------------- AlO2-(aq) + 4H+ + 3e-
Reduction Half
NO2-(aq) -+ 7H+ + 6e- --------------- NH3(g) + 2H2O(l)
Complete Balanced Reaction
NO2-(aq) + 2Al(s) + 2H2O(l) ------------ NH3(g) + 2AlO2-(aq) + H+(aq)
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