Balancing redox reactions in basic solution
Problem List

Examples 1-5      Problems 11-30
Problems 1-10      Balancing in acidic solution      Return to Redox menu

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¯


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 + SnO22- ----> SnO32- + 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: SO32- + Cr2O72- ---> Cr3+ + SO42-

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 #26: MnO4¯ + SO32¯ ---> MnO2 + SO42¯

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

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

Problem #29: N2H4 + Cu(OH)2 ---> Cu + 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


Examples 1-5      Problems 11-30
Problems 1-10      Balancing in acidic solution      Return to Redox menu