# Potassium reacts with water to produce _______ flame

Potassium burns in water with lilac coloured flame.

Potassium reacts with cold water and gives potassium hydroxide and hydrogen gas.

• 2K(s) + 2H2O(l) → 2KOH(aq) + H2(g)
• The reaction is so vigorous that the evolved hydrogen catches fire spontaneously.
• There is sometimes a small explosion at the end of the reaction.