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Q.
Which has highest $pH$:-
AIPMTAIPMT 2002Equilibrium
Solution:
Hint: From the composition of salt we can find out whether it is weak acid or base.
Explanation:
$NH _{4} Cl$ is acidic since it is salt of strong acid $( HCl )$ and weak base $\left( NH _{4} OH \right)$.
$\therefore pH _{ NH _{4} C 1}< 7$
$NaNO _{3}$ is neutral since it salt of strong acid $\left( HNO _{3}\right)$ and strong base $( NaOH )$.
$\therefore pH _{ NaNO _{3}}=7$
$CH _{3} COOK$ is weakly basic since it the salt of a weak acid $\left( CH _{3} COOH \right)$ and strong base $( KOH )$
$\therefore pH _{ CH _{3} COOK } >7$
$Na _{2} CO _{3}$ is the stronger base because it is the salt of weak acid $H _{2} CO _{3}$ and strong acid $NaOH$
$\therefore pH _{ Na _{2} CO _{3}} > pH _{ CH _{3} COOK } >7$