MCQ
The $pH$ of a buffer solution containg $0.2$ mole per litre $C{H_3}COONa$ and $1.5$ mole per litre $C{H_3}COOH$ is ($Ka$ for acetic acid is $1.8 \times {10^{ - 5}})$
- ✓$4.87$
- B$5.8$
- C$2.4$
- D$9.2$
✓
Answer
Correct option: A.
$4.87$
(a) $pH = - {\text{log}}\,{K_a} + {\text{log}}\frac{{{\text{[Salt]}}}}{{{\text{[Acid]}}}}$
$ = - \log \,\,[1.8 \times {10^{ - 5}}] + \log \frac{{0.2}}{{0.1}} = 4.87$
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
Impossible orbital among the following is:
What is the name of the alkene H2C=CH−CH=CH2?
The limiting line in Balmer series will have a frequency of (Rydberg constant,${R_\infty } = 3.29\, \times \,{10^{15}}\,{\rm{cycles/s}}$ )
→Which of the following have identical bond order?
Compounds belonging to a homologous series have the same:
In an octahedral structure, the pair of d-orbitals involved in d2sp3 hybridisation is:
Energy of electron of hydrogen atom in second Bohr orbit is
The titration curve of weak acid vs. strong base with phenolphthalein as indictor) is shown below. The $K _{\text {phenolphthalein }}=4 \times 10^{-10}$. Given: $\log 2=0.3$
→The number of following statements which is/are correct about phenolphthalein is $.....$.
$A$. It can be used as an indicator for the titration of weak acid with weak base.
$B$. It begins to change colour at $pH =8.4$
$C$. It is a weak organic base
$D$. It is colourless in acidic medium
Oxidation number of $N$ in ${(N{H_4})_2}S{O_4}$ is
→The reaction of propene with $H_3O^+$ will proceed with which of the following intermediates ?
→