Write the balanced equations in the manufacture of K2Cr2O7 from cromit

1.	Write the balanced equations in the manufacture of K2Cr2O7 from cromite ore?
Answer» Manufacture of K₂Cr₂O₇ from chromite ore involves the following steps Step-1: Conversion of chromite ore into sodium chromate: Chromite ore is heated with Na₂CO₃ in the presence of excess of air to form sodium chromate 4FeOCr₂O₃ + 8Na₂CO₃ + 7O₂→ 8Na₂CrO₄+ 2Fe₂O₃ + 8CO₂ Step-2: Conversion of sodium chromate into sodium dichromate. The yellow solution of sodium chromate is filtered and acidified with H₂SO₄ to give a mixture of Na₂Cr₂O₇ and sodium sulphate 2Na₂CrO₄ + H₂SO₄ → Na₂Cr₂O₇ + Na₂SO₄ + H₂O The less soluble Na₂SO₄ is removed by filtration. Step-3: Conversion of sodium dichromate into potassium dichromate: The solution of sodium dichromate is treated with KCl to give potassium dichromate. Na₂Cr₂O₇ + 2KCl → K₂Cr₂O₇ + 2NaCl

Write the balanced equations in the manufacture of K2Cr2O7 from cromite ore?

Answer»

Manufacture of K₂Cr₂O₇ from chromite ore involves the following steps

Step-1: Conversion of chromite ore into sodium chromate: Chromite ore is heated with Na₂CO₃ in the presence of excess of air to form sodium chromate

4FeOCr₂O₃ + 8Na₂CO₃ + 7O₂→ 8Na₂CrO₄+ 2Fe₂O₃ + 8CO₂

Step-2: Conversion of sodium chromate into sodium dichromate.

The yellow solution of sodium chromate is filtered and acidified with H₂SO₄ to give a mixture of Na₂Cr₂O₇ and sodium sulphate

2Na₂CrO₄ + H₂SO₄ → Na₂Cr₂O₇ + Na₂SO₄ + H₂O

The less soluble Na₂SO₄ is removed by filtration.

Step-3: Conversion of sodium dichromate into potassium dichromate: The solution of sodium dichromate is treated with KCl to give potassium dichromate.

Na₂Cr₂O₇ + 2KCl → K₂Cr₂O₇ + 2NaCl

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