Question

The compound whose aqueous solution has highest pH, is:

• A. $NaCl$
• B. ${NH}_{4}Cl$
• C. ${CH}_{3}COO{NH}_4$
• D. ${Na}_2{CO}_3$

Answer 1

The correct option is D ${Na}_2{CO}_3$

$NaCl$ is salt of strong acid and strong base so it has $pH$ of about 7.

$N{H}_{4}Cl$ is salt of strong acid and weak base so it has $pH$ is much less than 7.

$C{H}_{3}COON{H}_4$ is salt of weak acid and weak base so it has $pH$ of about 7.

$N{a}_{2}C{O}_3$ is salt of weak acid and strong base so it has $pH$ is much greater than 7.