Question

Identificati procesele de oxidare si de reducere si egalati ecuatiile reactiilor redox de mai jos. Indicati rolul apei oxigenate.

Answer 1

a) H₂⁺¹S⁺⁴O₃⁻² + H₂⁺¹O₂⁻¹ ⇒ H₂⁺¹S⁺⁶O₄⁻² + H₂⁺¹O⁻²

S⁺⁴ +2e⁻→ S⁺⁶ se reduce (ag.ox)        ||2||1

O₂⁻¹ -2e⁻→ 2O⁻² se oxideaza (ag.red) ||2||1

b) Pb⁺²S⁻² + 4H₂⁺¹O₂⁻¹ ⇒ Pb⁺²S⁺⁶O₄⁻² + 4H₂⁺¹O⁻²

S⁻² +8e⁻→ S⁺⁶ se reduce (ag.ox)          ||2||1

O₂⁻¹ -2e⁻→ 2O⁻² se oxideaza (ag.red)  ||8||4

c) 2K⁺¹Mn⁺⁷O₄⁻² + 5H₂⁺¹O₂⁻¹ + 3H₂⁺¹S⁺⁶O₄⁻² ⇒ K₂⁺¹S⁺⁶O₄⁻² + 2Mn⁺²S⁺⁶O₄⁻² + 8H₂⁺¹O⁻² + 5O₂⁰

Mn⁺⁷ +5e⁻→ Mn⁺² se reduce (ag.ox)  ||2

O₂⁻¹ -2e⁻→ 2O₂⁰ se oxideaza (ag.red) ||5

d) Ag₂⁺¹O⁻² + H₂⁺¹O₂⁻¹ ⇒ 2Ag⁰ + H₂⁺¹O⁻² + O₂⁰

Ag₂⁺¹ +2e⁻→ 2Ag⁺² se reduce (ag.ox) ||2||1

O₂⁻¹ -2e⁻→ 2O₂⁰ se oxideaza (ag.red) ||2||1

I don't know the last requirement