Question

Which of the following is not true for acidic solutions at room temperature?

• A. $\left[H^{+}\right]>\left[O{H}^{-}\right]$
• B. $\left[H^{+}\right]>{10}^{-7}M$
• C. $\left[H^{+}\right]<{10}^{-7}M$
• D. $\left[O{H}^{-}\right]<{10}^{-7}$

Answer 1

Answer: (C)

$\left[H^{+}\right]<{10}^{-7}M$

Far acidic solution,

PH<7
$pH=-log\left[H^{+}\right]$

$log\left[H^{+}\right]>-7\Rightarrow H^{+}>{10}^{-7}$

$\therefore \left[O{H}^{-}\right]<{10}^{-7}$

$\left[H^{+}\right]$ in acidic solution is greater than $\left[O{H}^{-}\right]$
$\therefore$ option C is not true for acidic solution.