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(i) Potassium dichromate is obtained from the fusion of chromite ore
with sodium and potassium carbonate in the free supply of air.
(ii) Sodium chromate is filtered and acidified with sulphuric acid (
) to form sodium dichromate, 
can be crystallised
(iii) Sodium dichromate is more soluble than potassium dichromate. So, treat the solution of dichromate with the potassium chloride(
)
The chromate and dichromate are interconvertible in aqueous solution at pH 4
Structures of chromate and dichromate ion