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Answer the following Which steps are involved in the manufacture of potassium dichromate from chromite ore? - Chemistry

Answer in Brief

Answer the following

Which steps are involved in the manufacture of potassium dichromate from chromite ore?

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Solution

Preparation of potassium dichromate:

In the industrial production, finely powdered chromite ore (FeOCr2O3) is heated with anhydrous sodium carbonate (Na2CO3) and flux of lime in the air in a reverberatory furnace.

\[\ce{4(FeO_.Cr2O3) + 8Na2CO3 + 7O2 ->[\Delta] 8Na2CrO4 + 2Fe2O3 + 8CO2}\].

Sodium chromate (Na2CrO4) formed in this reaction is then extracted with water and treated with concentrated sulphuric acid to get sodium dichromate and hydrated sodium sulphate:

\[\ce{2Na2CrO4 + H2SO4 -> Na2Cr2O7 + 2NaCl + Na2Cr2O7_.H2O}\]

Addition of potassium chloride to a concentrated solution of sodium dichromate precipitates less soluble orange-red coloured potassium dichromate, K2Cr2O7.

\[\ce{Na2Cr2O7 + 2KCl -> K2Cr2O7 + 2NaCl}\]

Concept: K2Cr2O7: Preparation of Potassium Dichromate
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APPEARS IN

Balbharati Chemistry 12th Standard HSC for Maharashtra State Board
Chapter 8 Transition and Inner transition Elements
Exercise | Q 2.04 | Page 191
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