Question

One liter of a strong acid solution contains ${10}^{-5}$ moles of $H^{+}$ ions. Then which of the following is /are correct?

• A. pOH $=9$
• B. Percentage ionisation of water in solution is $1.8\times {10}^{-9}\%$
• C. Number of $O{H}^{-}$ ions per mL of solution $=6.022\times {10}^{15}$
• D. $[H^{+}{]}_{from{H}_{2}O}={10}^{-9}$M

Answer 1

Answer: (A)

pOH $=9$

Concentration of $\left[H^{+}\right]$ ions= $\frac{{10}^{-5}moles}{1L}$

$\Rightarrow \left[H^{+}\right]={10}^{-5}M$

$\Rightarrow pH=-\log \left[H^{+}\right]=-\log \left[{10}^{-5}\right]$

$\Rightarrow pH=5$

$\Rightarrow pOH=14-pH=14-5=9$

$\Rightarrow pOH=9$ .