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How is Potassium Dichromate Prepared from Chrome Iron Ore? - Chemistry

Short Note

How is potassium dichromate prepared from chrome iron ore?

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Solution

Potassium dichromate is prepared from chromite ore (FeCr2O4) in the following steps.

Step (1): Preparation of sodium chromate

4FeCr2O4  + 16NaOH + 7O2 → 8NaCrO4  + 2Fe2O3 + 8H2O

Step (2): Conversion of sodium chromate into sodium dichromate

2Na2CrO4 + conc.H2SO4  → Na2Cr2O7 + Na2SO4 + H2O

Step(3): Conversion of sodium dichromate to potassium dichromate

Na2Cr2O7 + 2KCl → K2Cr2O7  + 2NaCl

Potassium dichromate being less soluble than sodium chloride is obtained in the form of orange coloured crystals and can be removed by filtration.

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