Question

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Answer 1

Sodium sulphate is formed by reaction of a strong acid and base that is H2SO4 and NaOH. Therefore it is neutral.

Whereas sodium carbonate is formed by reaction of a weak acid and strong base that is H2CO3 carbonic acid and NaOH. Therefore it is basic.
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Answer 2

First you have to understand that there are three types of salts.

1. neutral salt.-> A salt formed by the neutralization reaction of a strong base and a strong acid or the neutralization reaction of a weak base and a weak acid is neutral in nature.

Sodium Sulfate is neutral in nature therefore its aqueous solution will be too.

2. basic salt-> a salt form by a reaction of a strong base and a weak acid is a basic salt.

Aqueous solution of  Sodium Carbonate is therefore basic in nature.

3 . acidic salt-> a salt that is  formed by the reaction of a strong acid and a weak base is called an acidic salt.