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

$pH$ of an aqueous solution of $NH_4Cl$ is

Calculate the hydrolysis constant $(K_h)$ of the salt containing $NO_2^-$. Given the $K_a$ for $HNO_2 = 4.5 \times 10^{-10}$.

The aqueous solution of ammonium chloride is

If the base ionization constant $(K_b)$ of hydrazine $(N_2H_4)$ is $9.6 \times 10^{-9}$,what is the percentage of hydrolysis of a $0.1 \ M$ solution of the salt $N_2H_5Cl$?

The correct formula for the $pK_h$ value of a salt formed from a weak acid and a weak base is .....