Balancing redox reactions in basic solution
Problem List

Example #1: NH₃ + ClO¯ ---> N₂H₄ + Cl¯

Example #2: Au + O₂ + CN¯ ---> Au(CN)₂¯ + H₂O₂

Example #3: Br¯ + MnO₄¯ ---> MnO₂ + BrO₃¯

Example #4: AlH₄¯ + H₂CO ---> Al³⁺ + CH₃OH

Example #5: Se + Cr(OH)₃ ---> Cr + SeO₃²¯

Example #6: Au + NaCN + O₂ + H₂O ---> NaAu(CN)₂ + NaOH

Example #7: Ag₂S + CN¯ + O₂ ---> Ag(CN)₂¯ + S₈ + OH¯

Example #8: N₂H₄ + Cu(OH)₂ ---> N₂ + Cu

Example #9: MnO₄¯ + C₂O₄²¯ ---> MnO₂ + CO₃²¯

Example #10: Zn + NO₃¯ ---> Zn(OH)₄²¯ + NH₃

Example #11: Balance the equation for the reaction of stannous ion with pertechnetate in basic solution. Products are stannic ion, Sn⁴⁺ and technetium(IV), Tc⁴⁺ ions.

Example #12: Cr₂O₇²¯ + I₂ ---> Cr³⁺ + IO₃¯

Example #13: Bi³⁺ + MnO₄¯ ---> MnO₂ + BiO₃¯

Example #14: Co(OH)₂(s) + SO₃²¯(aq) ---> SO₄²¯(aq) + Co(s)

Example #15: PtO₄²¯ + Be ---> BeO₃²¯ + Pt(OH)₆²¯

Problem #1: OCN¯ + OCl¯ ---> CO₃²¯ + N₂ + Cl¯

Problem #2: Dentrification in soils and oceans occurs when the nitrate ion is reduced to nitrous oxide by anaerobic bacteria in the presence of water. Oxygen and the hydroxyl ion are also produced during this process. Write a balanced net-ionic equation for this reaction.

Problem #3: Al(s) + NO₂¯ (aq) ---> AlO₂¯ (aq) + NH₃(aq)

Problem #4: Cr(OH)₃ + ClO₃¯ ---> CrO₄²¯ + Cl¯

Problem #5: Bi(OH)₃ + SnO₂^2- ----> SnO₃^2- + Bi

Problem #6: Ni(OH)₂ + N₂H₄ ---> Ni + N₂

Problem #7: Fe(OH)₂ + H₂O₂ ---> Fe(OH)₃

Problem #8: ClO₂ + H₂O + KOH ---> H₂O + KClO₂ + O₂

Problem #9: Cr³⁺ + H₂O₂ + OH¯ --> CrO₄²¯ + H₂O

Problem #10: MnO₄¯ + H₂O + NO₂¯ ---> MnO₂(s) + NO₃¯ + OH¯

Problem #11: ClO₃¯ + N₂H₄ ---> NO + Cl¯

Problem #12: H₂O₂ + Cl₂O₇ ---> ClO₂¯ + O₂

Problem #13: HXeO₄¯ + Pb ---> Xe + HPbO₂¯

Problem #14: HPbO₂¯ + Cr(OH)₃ ---> Pb + CrO₄²¯

Problem #15: Basic solutions of thallium(III) oxide and hydroxylamine are mixed together to produce thallium(I) hydroxide and nitrogen gas

Problem #16: Mg + NiO₂ ---> Mg(OH)₂ + Ni(OH)₂

Problem #17: Cr(OH)₄¯ + H₂O₂ ---> CrO₄²¯ + H₂O

Problem #18: CrO₄²¯ + HSnO₂¯ + H₂O ---> CrO₂(s) + H₂SnO₃(aq) + OH¯(aq)

Problem #19: HXeO₄¯(aq) ---> XeO₆⁴¯(aq) + Xe(g)

Problem #20: S₂O₄²¯ + O₂(g) ---> SO₄²¯

Problem #21: SO₃^2- + Cr₂O₇^2- ---> Cr³⁺ + SO₄^2-

Problem #22: Sb₂O₃(s) + NO₃¯(aq) ---> H₃SbO₄(aq) + NO(g)

Problem #23: Al(s) + NO₃¯ ---> Al(OH)₄¯ + NH₃(g)

Problem #24: MnO₄¯ + I¯ ----> MnO₄²¯ + IO₃¯

Problem #25: Cu²⁺ + SO₃²¯ ---> SO₄²¯ + Cu

Problem #26a: MnO₄¯ + SO₃²¯ ---> MnO₂ + SO₄²¯

Problem #26b: MnO₄¯ + SO₃²¯ ---> MnO₄²¯ + SO₄²¯

Problem #27: MnO₄¯ + SO₃²¯ ---> Mn₂O₃ + S₂O₈²¯

Problem #28: MnO₄¯ + SbH₃ ---> MnO₂ + Sb

Problem #29: HPO₃²¯ + N₂H₄ ---> H₂PO₂¯ + N₂

Problem #30: Fe(OH)₂ + CrO₄²¯ ---> Fe₂O₃ + Cr(OH)₄¯

Problem #31: H₂O(ℓ) + S²¯(aq) + MnO₄¯(aq) ---> S₈(s) + MnS(s) + OH¯(aq)

Problem #32: H₂O(ℓ) + CN¯(aq) + MnO₄¯(aq) ---> CNO¯(aq) + MnO₂(s) + OH¯(aq)

Problem #33: Cr(s) + CrO₄²¯(aq) ---> Cr(OH)₃(s) + OH¯(aq)

Problem #34: CrO₄²¯(aq) + S₂O₄²¯(aq) ---> Cr(OH)₃(s) + SO₄²¯(aq) (basic)

Problem #35: Sn(OH)₃¯(aq) + Bi(OH)₃(s) + OH¯(aq) ---> Sn(OH)₆²¯(aq) + Bi(s)

Problem #36: MnO₂ + O₂ ---> MnO₄¯ + H₂O

Problem #37: CrO₄²¯ + S²¯ ---> Cr₂O₃ + S₈

Problem #38: MnO₄¯(aq) + I¯(aq) ---> MnO₂(s) + I₂(s)

Problem #39: ClO₂ + SbO₂¯ ---> ClO₂¯ + Sb(OH)₆¯

Problem #40: MnO₄¯ + C₂O₄²¯ ---> CO₂ + MnO₂

Problem #41: HXeO₄¯ + O₃ ---> XeO₆⁴¯

Problem #42: HCN ---> CO₃²¯ + NH₃ Is this an oxidation or reduction?

Problem #43: MnO₄¯ + SO₃²¯ ---> S₂O₈²¯ + Mn₂O₃

Problem #44: Al + KOH + H₂SO₄ + H₂O ---> KAl(SO₄)₂ ⋅ 12H₂O + H₂

Problem #45: Al(s) + H₂O(ℓ) ---> Al(OH)₄¯(aq) + H₂(g)

Problem #46: Ag₂O(s) + HPO₃²¯(aq) ---> AgO(s) + H₂PO₂¯(aq)

Problem #47: V + ClO₃¯ ---> HV₂O₇³¯ + Cl¯

Problem #48: AsO₄³¯ + NO₂¯ ---> AsO₂¯ + NO₃¯

Problem #49: Ag₂S(s) + Cr(OH)₃(s) ---> Ag(s) + HS¯(aq) + CrO₄²¯(aq)

Problem #50: Co(OH)₃(aq) + Sn(s) ---> Co(OH)₂(aq) + HSnO₂¯(aq)