- The ion-electron method is based on the principle that the total number of electrons lost by the reducing agent must equal the total number of electrons gained by the oxidizing agent. It involves splitting the reaction into two half-reactions (oxidation and reduction), balancing atoms and charges in each half-reaction separately, and then combining them so that electrons cancel out.
- I. Fe₂O₃ + 2Al → Al₂O₃ + 2Fe (already balanced)
- II. Cu + 4HNO₃ → Cu(NO₃)₂ + 2NO₂ + 2H₂O
- III. MnO₂ + 4HCl → MnCl₂ + Cl₂ + 2H₂O
- IV. Zn + 2HCl → ZnCl₂ + H₂
- V. 6Fe²⁺ + Cr₂O₇²⁻ + 14H⁺ → 6Fe³⁺ + 2Cr³⁺ + 7H₂O
- VI. K₂Cr₂O₇ + 14HCl → 2KCl + 2CrCl₃ + 3Cl₂ + 7H₂O
- VII. 2Cr(OH)₃ + IO₃⁻ + 4OH⁻ → I⁻ + 2CrO₄²⁻ + 5H₂O
Parent Tip: Review the logic above to help your child master the concept of redox reaction worksheet.
