The latter is therefore, prepared by treating the solution of sodium
dichromate with potassium chloride Na2Cr2O7 + 2 KCl ® K2Cr2O7 + 2 NaCl
Orange crystals of potassium dichromate crystallise out The
chromates and dichromates are interconvertible in aqueous solution
depending upon pH of the solution The oxidation state of chromium
in chromate and dichromate is the same