MCQ
$K _{ a }$ for butyric acid $\left( C _{3} H _{7} COOH \right)$ is $2 \times 10^{-5}$. The $pH$ of $0.2 M$ solution of butyric acid is $...........\times 10^{-1}$. (Nearest integer) [Given $\log 2=0.30]$
- A$26$
- B$25$
- ✓$27$
- D$29$
✓
Answer
Correct option: C.
$27$
c
$K _{ a }$ of Butyric acid $\Rightarrow 2 \times 10^{-5} PKa =4.7$
$K _{ a }$ of Butyric acid $\Rightarrow 2 \times 10^{-5} PKa =4.7$
$pH$ of $0.2\,M$ solution
$pH =\frac{1}{2} pK _{ a }-\frac{1}{2} \log C$
$=\frac{1}{2}(4 \cdot 7) \frac{1}{2} \log (0.2)$
$=2.35+0.35=2.7$
$pH =27 \times 10^{-1}$
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
When electronic transition occurs from higher energy state to lower energy state with energy difference equal to $\Delta E$ electron volts, the wavelength of the line emitted is approximately equal to
→Metal carbonates decompose on heating to give metal oxide and carbon dioxide. Which of the metal carbonates is most stable thermally?
Correct statements among the following is/are
Consider the following figure :
Which one of the following interactions is shown between the two $\text{HCl}$ molecules?
→Which one of the following interactions is shown between the two $\text{HCl}$ molecules?
Which of the following ions is not having the configuration of neon
Consider the following reactions $A$ is
→In a sigma bond
Circle represent most acidic hydrogens in these molecules. Which of the following is correct representation ?
The shape of $2p$ orbital is
→16g of oxygen has same number of molecules as in: