8Na3[Cr(OH)6] + 3HClO4 → 8Na2CrO4 + 3NaCl + 8NaOH + 2H2O
Sodium hexahydroxochromate(III) react with perchloric acid to produce sodium chromate, sodium chloride, sodium hydroxide and water. Perchloric acid anhydrous. The reaction takes place in a boiling solution.