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.