Question

From separate solutions of four sodium salts, $NaW,NaX,NaY$ and $NaZ$ had $pH7.0,9.0,10.0$ and $11.0$ respectively, when each solution was $0.1M$, the weakest acid is:

• A. $HW$
• B. $HX$
• C. $HY$
• D. $HZ$

Answer 1

The correct option is D $HZ$

For strong acid $pH$ should be lower

So, $HZ$ (corresponding to $\underset{}{NaZ}$)

Salt of $\underset{}{SB+WA}$

gives more basic in $H_{2}O$.