What happens when solid $Na_2CO_3$ is dissolved in water?

When $1 \ mol$ of aniline hydrochloride is dissolved in $99.2 \ L$ of water,the degree of hydrolysis is $4.88 \%$. Calculate the hydrolysis constant $(K_h)$.

The salt that forms a neutral solution in water is

Which one of the following salts gives an acidic solution in water?

What does the hydrolysis of $AlCl_{3}$ produce?

For a weak acid $HX$ with $K_a = 1 \times 10^{-5}$,the reaction with $NaOH$ gives $NaX$. What is the percentage of hydrolysis $(\% \, h)$ for a $0.1 \, M$ aqueous solution of $NaX$?