Question

Egalati urmatoarea reactie redox si indicati agentii oxidanti si reducatori:

K₂⁺¹Cr₂⁺⁶O₇⁻² + H₂⁺¹SO₄⁻² + Fe⁺²SO₄⁻² ⇒K₂⁺¹SO₄⁻² + Cr₂⁺³(SO₄)₃⁻² + Fe₂⁺³(SO₄)₃⁻² + H₂⁺¹O⁻²

Answer 1

1ₓ| 2Cr⁺⁶ +2x3e = 2Cr⁺³ accepta e⁻; se reduce ; K2Cr2O7 = agent oxidant
6ₓ| Fe⁺² = Fe⁺³ + 1e⁻   cedeaza e⁻; se oxideaza; FeSO4 = agent reducator
K2Cr2O7 +7 H2SO4 + 6FeSO4 = K2SO4 + Cr2(SO4)3 + 3Fe2(SO4)3 +7H2O