Question

Column I		Column II
A	Acidic salt	p	$pH =\frac{1}{2}\left( p K_w- p K_b-\log C\right)$
B	Basic salt	q	$pH =\frac{1}{2}\left( p K_w+ p K_b+\log C\right)$
C	Acidic buffer	r	$pOH = p K_b+\log \frac{\text { [Salt }]}{[\text { Base }]}$
D	Basic buffer	s	$pH = p K_a+\log \frac{[\text { Salt }]}{[\text { Base }]}$

• A. A - (q), B - (r), C - (p), D - (s)
• B. A - (r), B - (s), C - (q), D - (p)
• C. A - (s), B - (p), C - (r), D - (q)
• D. A - (p), B - (q), C - (s), D - (r)

Answer 1

Answer: (D)

$( a \rightarrow p )$ Acidic salt: aqueous solution of salt is acidic
$( pH <7) pH =\frac{1}{2}\left( p K_w- p K_b-\log C\right)$
$( b \rightarrow q )$ Basic salt: Aqueous solution of salt is basic
$( pH >7) pH =\frac{1}{2}\left( p K_w+ p K_b+\log C\right)$
$( c \rightarrow s )$ Acidic buffer: $pH = p K_a+\log \frac{\text { [Salt }]}{[\text { Acid }]}$
$( d \rightarrow r )$ Basic buffer: $pOH = p K_b+\log \frac{[\text { Salt }]}{[\text { Base }]}$