Aqueous solution of $CuSO_4 \cdot 5H_2O$ changes blue litmus paper to red due to:

Arrange the aqueous solutions of the following salts in the increasing order of their $pH$.
$I$. $CuSO_4$
$II$. $NaCN$
$III$. $KCl$

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

Calculate the $pH$ of a $0.1 \ M$ sodium acetate solution. Given: $K_a$ for $CH_3COOH = 1.8 \times 10^{-5}$.

$2.5 \ mL$ of $0.4 \ M$ weak monoacidic base ($K_{b}=1 \times 10^{-12}$ at $25^{\circ} C$) is titrated with $\frac{2}{15} \ M \ HCl$ in water at $25^{\circ} C$. The concentration of $H^{+}$ at equivalence point is ($K_{w}=1 \times 10^{-14}$ at $25^{\circ} C$).

If the $pKa$ of lactic acid is $5$,then the $pH$ of $0.005 \ M$ calcium lactate solution at $25^{\circ} \ C$ is $........ \times 10^{-1}$ (Nearest integer). The structure of lactic acid is given below: