Question

why washing soda is called baisc salt

Answer 1

I hope this will help you

Answer 2

Washing soda (Sodium Carbonate) is basic in nature. It acts as an alkali because when dissolved in water, it dissociates into the weak acid: carbonic acid and the strong alkali: sodium hydroxide. This gives sodium carbonate in solution the ability to attack metals such as aluminium with the release of hydrogen gas.