$A$ certain buffer solution contains equal concentrations of $X^-$ and $HX$. If the $K_a$ of $HX$ is $10^{-8}$,then the $pH$ of the buffer solution will be ...... .

Which of the following mixtures will produce a buffer solution with $pH = 9$?

The dissociation constant of acetic acid is $x \times 10^{-5}$. When $25 \ mL$ of $0.2 \ M \ CH_3COONa$ solution is mixed with $25 \ mL$ of $0.02 \ M \ CH_3COOH$ solution,the $pH$ of the resultant solution is found to be equal to $5$. The value of $x$ is $..........$.

Buffer solutions have constant acidity and alkalinity because

In which of the following does a buffer solution play an important role?

$A$ solution of $H_3BO_3$ and borax is known as: