Balancing redox reactions
- On balancing the given redox reaction,a Cr_2O_7^2- + b SO_3^2-(aq) + c H^+(aq) → 2a Cr^3+(aq) + b SO_4^2-(aq) + c2H_2O()the coefficients a, b and c are found to be, respectively - Answer: 2. 1, 3, 8 Key idea: Balance by the ion-electron (or oxidation-number) method. Cr goes from +6 to +3: gain of 3 e ^- per Cr, 6 e ^-... 1
- For the redox reactionMnO_4^- + C_2O_4^2- + H^+ Mn^2+ + CO_2 + H_2Othe correct coefficients of the reactants for the balanced equation are(columns: MnO_4^-, C_2O_4^2-, H^+) Answer: 3. 2, 5, 16 Balance by the ion-electron method. Reduction: mathrmMnO₄^-+8H^++5e^-→ Mn²⁺+4H₂O . Oxidation: mathrmC₂O₄²⁻→2CO₂+2e^- . M... 1