un sistem oxidant este K2Cr2O7 + CH3COOH
+6 -2 +3 0
K2Cr2O7 + CH3COOH --> CH3COOK + Cr(CH3COO)3 + H2O + [O]
Cr(+6) __+3e-__> Cr(+3) reducere (ag. oxidant, K2Cr2O7)
O(-2) __-2e-__> O(0) oxidare (ag. reducator, CH3COOH)
2x Cr(+6) __+3e-__> Cr(+3) reducere (ag. oxidant, K2Cr2O7)
3x O(-2) __-2e-__> O(0) oxidare (ag. reducator, CH3COOH)
K2Cr2O7 + 8CH3COOH --> 2CH3COOK + 2Cr(CH3COO)3 + 6H2O + [O]