Chromate and dichromate ions are interconvertible, justify this.
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The chromates and dichromates are inter convertible.
2CrO4 2- + 2H2+ ---------> Cr2O7 2- + H2O
Cr2O7 2- + 2OH- ---------> 2CrO4 2- + H2O
They two exist in equilibrium with each other at a pH of 4. Yellow chromate changes into orange dichromate in acid medium and dichromate changes into chromate in basic medium.
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