Balancing redox reactions in acidic solution
Problem List

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

Example #2a: H₂S + NO₃¯ ---> S₈ + NO

Example #2b: H₂S + HNO₃ ---> NO + S + H₂O

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

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

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

Example #5b: MnO₄¯ + CH₃OH ---> CH₃COOH + Mn²⁺

Example #5c: MnO₄¯ + H₂O₂ ---> Mn²⁺ + O₂

Example #6: VO²⁺ + MnO₄¯ ---> V(OH)₄⁺ + Mn²⁺

Example #7: Cr₂O₇²¯ + Cl¯ ---> Cr³⁺ + Cl₂

Example #8: MnO₄¯(aq) + S²¯(aq) ---> MnS(s) + S(s)

Example #9: As₂S₅(s) + NO₃¯(aq) ---> H₃AsO₄(aq) + HSO₄¯(aq) + NO₂(g)

Example #10: H₃AsO₃ + I₂ ---> H₃AsO₄ + I¯

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

Example #12: H₃AsO₄ + Zn + HNO₃ --> AsH₃ + Zn(NO₃)₂

Example #13: O₃ + Cl¯ ---> H₂O + ClO₃¯

Example #14: HSO₅¯ + ClO₂¯ ---> ClO₃¯ + SO₄²¯

Example #15: As ---> H₃AsO₄ + AsH₃

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

Problem #2: HNO₂ ---> NO + NO₂

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

Problem #3b: C₂O₄²¯ + MnO₂ ---> 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 #26a: As₂O₃ + NO₃¯ ---> H₃AsO₄ + N₂O₃

Problem #26b: As₂O₃ + NO₃¯ ---> H₃AsO₄ + NO

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

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

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

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

Problem #30b: H₂O₂ + CrO₄²¯ ---> 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

Problem #41: Cr(s) + O₂(g) --> Cr³⁺(aq)

Problem #42: Cr₂O₇²¯ + Cu⁺ ---> Cr³⁺ + Cu²⁺

Problem #43: IO₃¯ + H₂SO₃ ---> I₂ + SO₄²¯

Problem #44: NO₃¯ + Sn²⁺ ---> NO + Sn⁴⁺

Problem #45: NO₃¯ + S²¯ ---> S₈ + NO₂

Problem #46: HNO₂ + In⁺ ---> NO + In³⁺

Problem #47: HNO₃ + I₂ ---> HIO₃ + NO₂ + H₂O

Problem #48: VO₂⁺ + Sn²⁺ ---> VO²⁺ + Sn⁴⁺

Problem #49: C₂H₅OH(aq) + Cr₂O₇²¯(aq) + H₃O⁺(aq) ---> CH₃COOH(aq) + Cr³⁺(aq) + H₂O(ℓ)

Problem #50: H₃PO₂ + Cr₂O₇²¯ ---> H₃PO₄ + Cr³⁺