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proces utlenienia: NO₂⁻ + H₂O ---> NO₃⁻ + 2 H⁺ + 2e /*3
Cr₂O₇²⁻ + 14 H⁺ + 3 NO₂⁻ + 3 H₂O ---> 2 Cr³⁺ + 7 H₂O + 3 NO₃⁻ + 6 H⁺
Cr₂O₇²⁻ + 8 H⁺ + 3 NO₂⁻ ---> 2 Cr³⁺ + 4 H₂O + 3 NO₃⁻
K₂Cr₂O₇ + 3 KNO₂ + 4 H₂SO₄ ---> Cr₂(SO₄)₃ + 3 KNO₃ + K₂SO₄ + 4 H₂O