K2Cr2O7+H2SO4+NaNO2=Cr2(SO4)3+NaNO3+K2SO4+H2O ионно-молекулярная форма
Cr₂O₇²⁻+14H⁺+6e=2Cr³⁺+7H₂O |1 NO₂⁻+H₂O-2e=NO₃⁻+2H⁺ | 3 ____________________________________ Cr₂O₇²⁻+14H⁺+3NO₂⁻+3H₂O=2Cr³⁺+7H₂O+3NO₃⁻+6H⁺ Cr₂O₇²⁻+8H⁺+3NO₂⁻+=2Cr³⁺+4H₂O+3NO₃⁻ K₂Cr₂O₇+4H₂SO₄+3NaNO₂=Cr₂(SO₄)₃+3NaNO₃+K₂SO₄+4H₂O