Equilibrium - Result Question 90
####94. Which has the highest value of $pH$ ?
[2002]
(a) $CH_3 COOK$
(b) $Na_2 CO_3$
(c) $NH_4 Cl$
(d) $NaNO_3$
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Solution:
- (b) $Na_2 CO_3$ is a salt of weak acid $H_2 CO_3$ and strong base $NaOH$, therefore, its aqueous solution will be basic hence has $pH$ more than 7 .
$ Na_2 CO_3+2 H_2 O \longrightarrow \underset{\text{ strong base }}{2 NaOH}+\underset{\text{ weak acid }}{2 H_2 CO_3} $
