Question

Salt having pH of its aqueous solution greater than 7, is:

• A. $N{H}_{4}Cl$
• B. $NaCl$
• C. $C{H}_{3}COONa$
• D. $N{H}_{4}N{O}_3$

Answer 1

The correct option is C $C{H}_{3}COONa$

• $C{H}_{3}COONa$ is a salt of weak acid and strong base, so its aqueous solution has its pH > 7.
  $pH=7+\frac{1}{2}(p{K}_a+\text{logC})$, where C is the concentration of the salt.
  
• $N{H}_{4}Cl,N{H}_{4}N{O}_3$ are the salts of strong acid and weak base, so these have their pH < 7.

• $NaCl$ is a salt of strong acid and strong base so, its pH = 7.