2KCr(SO4)2 + 10KOH + 3H2O2 → 2K2CrO4 + 4K2SO4 + 8H2O
Chromium(III)-potassium sulfate react with potassium hydroxide and hydrogen peroxide to produce potassium chromate, potassium sulfate and water. Potassium hydroxide and hydrogen peroxide - concentrated solutions.