Make up the reaction equation: 1) Cr- Cr2O3- Cr2 (SO4) 3- Cr (oh) 3- H2CrO4; 2) Cr (Oh) 3- KCrO2- K2Cr2O7

univerkov | August 8, 2021 | education

1.Cr–>Cr2O3–>Cr2(SO4)3–>Cr(oh)3–>H2CrO4;
1) 4Cr + 3O₂ = 2Cr₂O₃;
2) Cr₂O₃ +3H₂SO₄= Сr₂(SO₄)₃ + 3H₂O;
3) Сr₂(SO₄)₃ + 6NaOH = 2Сr(OH)₃ + 3Na₂SO₄;
4) 2Сr(OH)₃ + 3H₂O₂ = 2H₂CrO₄ + 4H₂O.

2. Cr(Oh)3–>KCrO2–>K2Cr2O7;

1) Сr(OH)₃ + KOH = KCrO₂ + 2H₂O;

2) 2KCrO₂ + 3H₂O₂ = K₂Cr₂O₇ + 3H₂O.

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