Question

The given aqueous solution at ${25}^{o}C$ is:

• A. acidic if $\left[H^{+}\right]<\sqrt{K_w}$
• B. alkaline if $\left[H^{+}\right]<\sqrt{K_w}$
• C. acidic if $\left[H^{+}\right]>\sqrt{K_w}$
• D. neutral if $\left[H^{+}\right]=\sqrt{K_w}$

Answer 1

Answer: (B), (C), (D)

The correct options are
B neutral if $\left[H^{+}\right]=\sqrt{K_w}$
C acidic if $\left[H^{+}\right]>\sqrt{K_w}$
D alkaline if $\left[H^{+}\right]<\sqrt{K_w}$

$\left[H^{+}\right]\left[O{H}^{-}\right]=K_w$

and $\left[H^{+}\right]=\left[O{H}^{-}\right]$ in neutral solution

So, solution will be neutral if

$\left[H^{+}\right]=\sqrt{K_w}$

In alkaline solution,

$\left[H^{+}\right]<\left[O{H}^{-}\right]$

so $\left[H^{+}\right]<\sqrt{K_w}$

In acidic solution,

$\left[H^{+}\right]>\left[O{H}^{-}\right]$

so $\left[H^{+}\right]>\sqrt{K_w}$