$A$ few grams of sodium carbonate $(Na_2CO_3)$ is added to $1 \ L$ of water. What is the $pH$ or $pH$ range of the resultant solution?

Which of the following aqueous solutions will have the highest $pH$?

Ionization constants for $CH_3COOH$ and $HCN$ are respectively $1.8 \times 10^{-5}$ and $7.2 \times 10^{-10}$. The degree of hydrolysis of $0.1 \ M \ KCN$ $(h_1)$ and $0.1 \ M \ CH_3COOK$ $(h_2)$ follows the order :

The aqueous solution of the following salt will have the lowest $pH$:

Why is the $pH$ of an aqueous solution of copper sulphate less than $7$?

The percentage degree of hydrolysis of a salt of weak acid $(HA)$ and weak base $(BOH)$ in its $0.1 \ M$ solution is found to be $10 \%$. If the molarity of the solution is $0.05 \ M$,the percentage hydrolysis of the salt should be ....... $\%$.