MCQ
$0.01\,\,M\,HA\,(aq.)$ is $2\%$ ionized $; [OH^-]$ of solution is
- A$2 \times 10^{-4}$
- B$ 10^{-8}$
- ✓$5 \times 10^{-11}$
- D$5 \times 10^{-12}$
✓
Answer
Correct option: C.
$5 \times 10^{-11}$
c
$\mathrm{HA}_{(\mathrm{aq})} \rightleftharpoons \mathrm{H}_{(\mathrm{aq})}^{+}+\mathrm{A}_{(\mathrm{aq})}^{-}$
$\mathrm{HA}_{(\mathrm{aq})} \rightleftharpoons \mathrm{H}_{(\mathrm{aq})}^{+}+\mathrm{A}_{(\mathrm{aq})}^{-}$
$\Rightarrow \frac{\left[\mathrm{H}^{+}\right]}{[\mathrm{HA}]} \times 100=2$
$\Rightarrow \frac{\left[\mathrm{H}^{+}\right]}{0.01} \times 100=2$
$\Rightarrow\left[\mathrm{H}^{+}\right]=\frac{0.02}{100}=2 \times 10^{-4} \mathrm{M}$
$\therefore\left[\mathrm{OH}^{-}\right]=\frac{10^{-14}}{2 \times 10^{-4}}=0.5 \times 10^{-10} \mathrm{m}$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A reduction in atomic size with increase in atomic number is a characteristic of elements of
Which of the following double salt does not exist ?
Which of the following has $ds{p^2}$ hybridization
→For a cell reaction involving two electron change, the standard $EMF$ of the cell is $0.295\,V$ at $2\,^oC$. The equilibrium constant of the reaction at $25\,^oC$ will be
→When light is directed at the metal surface, the emitted electrons
The oxidation potentials of following half-cell reactions are given
→$Zn \to Z{n^{2 + }} + 2{e^ - };{E^o} = 0.76\,\,V$,$Fe \to F{e^{2 + }} + 2{e^ - };{E^o} = 0.44\,\,V$ what will be the emf of cell, whose cell-reaction is ............ $\mathrm{V}$
$F{e^{2 + }}(aq) + Zn \to Z{n^{2 + }}(aq) + Fe$
$pH$ of a mixture of $1\, M$ benzoic acid $(pK_a = 4.20)$ and $1\,M C_6H_5$ $COONa$ is $4.5$, what is the volume of benzoic acid required to prepare a $300\, ml$ buffer $[log \,2 = 0.3]$? .....$ml$
→For a given value of quantum number $l$, the number of allowed values of $m$ is given by
→(product)
The first ionisation potentials $(eV)$ of $Be$ and $B$ respectively are :-
→