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How Do You Prepare: Na2cr2o7 from Na2cro4? - Chemistry

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How do you prepare:

Na2Cr2O7 from Na2CrO4?

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Solution

Na2Cr2O7 can be prepared from Na2CrO4 in the following way:
For the preparation of sodium dichromate, the yellow solution of sodium chromate is acidified with sulphuric acid to give a solution from which orange sodium dichromate, Na2Cr2O7.2H2O can be crystallised.
Balanced equation for above reactions is as follows:

 2 Na2CrO4 + 2 H+ Na2Cr2O7 + 2 Na+ + H2O
                      Yellow                       Orange

Concept: P - Block Group 16 Elements - Sulphur - Allotropic Forms
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