Question

How is potassium dichromate prepared ? What
happens when potassium dichromate reacts with.​

Answer 1

Answer:

Potassium dichromate or anhydrochromate is prepared by adding to the neutral yellow chromate of potassium in solution, a moderate quantity of one of the stronger acids.

Explanation:

Preparation of Potassium Dichromate – K2Cr2O7

• Potassium dichromate is an important chemical used in industries as an oxidizing agent and for the preparation of many other compounds.
• Dichromates are usually prepared from chromates and this is obtained by the combination of chromite ore with sodium/potassium carbonate in the presence of air. The equation can be given as:

4FeCr2O4 + 8Na2CO3 + 7O2 → 8Na2CrO4 + 2Fe2O3 + 8CO2

The solution of sodium chromate (Na2CrO4) is further purified with sulphuric acid to form a solution from which the crystals of orange coloured sodium dichromate (Na2Cr2O7.2H2O) can be extracted.

2Na2CrO4 + 2H+ → Na2Cr2O7 + 2Na+ + H2O

Now potassium dichromate can be obtained by reacting a solution of sodium dichromate with potassium chloride.

Na2Cr2O7 + 2KCl → K2Cr2O7 + 2NaCl

Thus, we finally obtain the orange crystals of potassium dichromate.

Potassium dichromate react with sulfuric acid to produce chromium trioxide, potassium sulfate and water.

Answer 2

Answer:

Preparation of Potassium Dichromate – K2Cr2O

Preparation of Potassium Dichromate – K2Cr2OThe solution of sodium chromate (Na2CrO4) is further purified with sulphuric acid to form a solution from which the crystals of orange coloured sodium dichromate (Na2Cr2O7. ... Thus, we finally obtain the orange crystals of potassium dichromate.

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