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• Aqueous solution of sodium sulphate gets hydrolysed to form sodium hydroxide and sulphuric acid which are strong base and strong acid, respectively. So, its aqueous solution is neutral.

• When sodium carbonate is dissolved in water, it gets hydrolysed to some extent and forms sodium hydroxide and carbonic acid. Now sodium hydroxide is a strong base which is fully ionised and gives a large amount of hydroxide ions [OH^–(aq)]. On the other hand, carbonic acid is a weak acid which is only slightly ionised and hence gives small amount of hydrogen ions [H⁺(aq)]. The mixture contains more of hydroxide ions than hydrogen ions, so it is basic in nature.