KMnO4 + K2SO3 + 2KOH → K3MnO4 + K2SO4 + H2O
Potassium permanganate react with potassium sulfit and potassium hydroxide to produce potassium gipomanganate, potassium sulfate and water. Potassium sulfite - solid. Potassium hydroxide - concentrated solution. This reaction takes place at a temperature near 0°C.