The $pH$ of an acidic buffer mixture is

$20 \ mL$ of $0.1 \ M \ H_2SO_4$ is added to $30 \ mL$ of $0.2 \ M \ NH_4OH$ solution. The $pH$ of the resultant mixture is [$pK_b$ of $NH_4OH = 4.7$].

The $pK_a$ of a weak acid $(HA)$ is $4.5$. The $pOH$ of an aqueous buffered solution of $HA$ in which $50\%$ of the acid is neutralized in its titration with a strong base $(BOH)$ is

What are buffer solutions? Explain types of buffer solutions with examples.

$A$ buffer solution is prepared by mixing $0.1 \ M \ HCN$ and $0.2 \ M \ NaCN$. What is the $pH$ of the buffer solution if $pKa$ of $HCN$ is $9.3$? $(\log 2 = 0.3010)$

Which of the following is a buffer solution?