Sodium carbonate in aqueous solution is

Sodium carbonate solution in water is alkaline due to :

Sodium carbonate solution is alkaline due to hydrolysis of ____________ .

A solution of sodium carbonate in water is

Why sodium carbonate solution is alkaline ?

Consider the following salts : Sodium sulphate, Sodium carbonate, Ammonium sulphate The aqueous solution of which of these salts will: turn phenolphthalein to pink ?