What is the nature of aqueous solutions of pure 'sodium chloride' and pure 'sodium carbonate'?

An aqueous solution of sodium chloride (NaCl) is neutral but an aqueous solution of sodium carbonate (Na2CO3) is basic.

NaCl is salt of strong acid HCl (Hydrochoric acid) and strong base NaOH (sodium hydroxide). It does not undergo hydrolysis as there is no reaction between ions of salt NaCl with water. Aqueous solution of NaCl contains equal number of H+ and OH - ions, hence it is neutral in nature (pH=7).

On other hand, sodium carbonate is a salt of weak acid H2CO3 (Carbonic acid) and strong base NaOH. When it is dissolved in water, it undergo anionic hydrolysis. Thus salt solution contains OH- ions. Hence aqueous solution of sodium carbonate is basic (pH>7) in nature. Carbonic acid is an aqueous solution of carbon dioxide (CO2).