Balancing redox reactions in acidic solution
Problem List

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

Example #1: ClO3¯ + SO2 ---> SO42¯ + Cl¯

Example #2: H2S + NO3¯ ---> S8 + NO

Example #3: MnO4¯ + H2S ---> Mn2+ + S8

Example #4: Cu + SO42¯ ---> Cu2+ + SO2

Example #5: MnO4¯ + CH3OH ---> HCOOH + Mn2+


Problem #1: Cr2O72¯ + Fe2+ ---> Cr3+ + Fe3+

Problem #2: HNO2 ---> NO + NO2

Problem #3: H2C2O4 + MnO4¯ ---> CO2 + Mn2+

Problem #4: O2 + As ---> HAsO2 + H2O

Problem #5: NO3¯ + I2 ---> IO3¯ + NO2

Problem #6: HBr + SO42¯ ---> SO2 + Br2

Problem #7: H5IO6 + Cr ---> IO3¯ + Cr3+

Problem #8: Fe + HCl ---> HFeCl4 + H2

Problem #9: NO3¯ + H2O2 ---> NO + O2

Problem #10: BrO3¯ + Fe2+ ---> Br¯ + Fe3+


Problem #11: Cr2O72¯ + C2H4O ---> CH3COOH + Cr3+

Problem #12: MnO4¯ + C2H4O ---> CH3COOH + MnO2

Problem #13: Zn + NO3¯ ---> NH4+ + Zn2+

Problem #14: NO2 + H2O ---> HNO3 + NO

Problem #15: S2¯ + NO3¯ ----> NO + S8

Problem #16: CuS + NO3¯ ---> NO + Cu2+ + HSO4¯

Problem #17: Ru(s) + Cl¯(aq) + NO3¯(aq) ---> RuCl63¯(aq) + NO2(g)

Problem #18: IO3¯(aq) + I2(s) ---> I2(s) + HIO(aq)

Problem #19: PH3 + I2 ---> H3PO2 + I¯

Problem #20: P4 + HNO3 ---> H3PO4 + NO

Problem #21: BrO3-(aq) + N2H4(aq) ---> Br2(ℓ) + N2(g)

Problem #22: FeSO4 + H2O2 ---> Fe2O3 + SO42¯ + H2O

Problem #23: Cr2O72¯ + H+ + I¯ ---> Cr3+ + I2 + H2O

Problem #24: S2O82¯ + Mn2+ ---> SO42¯ + MnO4¯

Problem #25: HNO3 + Cu2O --> Cu(NO3)2 + NO + H2O

Problem #26: As2O3 + NO3¯ ---> H3AsO4 + N2O3

Problem #27: MnO4¯ + S2O32¯ ---> Mn2+ + SO42¯

Problem #28: MnO4¯ + H2SO3 ---> Mn2+ + HSO4¯

Problem #29: MnO4¯ + HSO3¯ ---> Mn2+ + SO42¯

Problem #30: H2O2 + Cr2O72¯ ---> Cr3+ + O2 + H2O

Problem #31: Cl2 + CrO42¯ + H+ ---> Cr3+ + ClO3¯ + H2O

Problem #32: IO3¯(aq) + SO2(g) ---> I2(s) + SO42¯(aq)

Problem #33: Cr2O72¯ + Mn2+ --> Cr2+ + MnO4¯

Problem #34: Mn2+(aq) + BiO3¯(aq) ---> MnO4¯(aq) + Bi3+(aq)

Problem #35: Cr2O72¯ + CH3CH2OH ---> Cr3+ + CH3CHO

Problem #36: S2O32¯ + OCl¯ ---> Cl¯ + S4O62¯

Problem #37: Cr3+ + BiO3¯ ---> Cr2O72¯ + Bi3+

Problem #38: HNO2 + MnO4¯ ---> Mn2+ + NO3¯

Problem #39: V ---> H2V2O42¯ + VH3

Problem #40: Bi2O4 + MoO2+ ---> BiO+ + H2MoO4


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