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

Which oxychloride has maximum $pH$?

The aqueous solution of which of the following salts has the lowest $pH$?

What is the process called when $CH_3COONa$ is dissolved in water?

The ionization constant of ammonium hydroxide at $298 \ K$ is $1.77 \times 10^{-5}$. Calculate the hydrolysis constant of ammonium chloride.

The degree of hydrolysis of a salt of a weak acid and a weak base in its $0.1 \ M$ solution is found to be $50 \ \%$. If the molarity of the solution of the same salt is $0.5 \ M$,then the percentage degree of hydrolysis of the salt should be ......... $\%.$