JEE Mains · Chemistry · STD 11 - 6.2. Equilibrium - II (icon Equilibrium)
\(K _{ a }\) 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 \(25\)
- C \(27\)
- D \(29\)
Answer & Solution
Correct Answer
(C) \(27\)
Step-by-step Solution
Detailed explanation
\(K _{ a }\) of Butyric acid \(\Rightarrow 2 \times 10^{-5} PKa =4.7\) \(pH\) of \(0.2\,M\) solution \(pH =\frac{1}{2} pK _{ a }-\frac{1}{2} \log C\) \(=\frac{1}{2}(4 \cdot 7) \frac{1}{2} \log (0.2)\) \(=2.35+0.35=2.7\) \(pH =27 \times 10^{-1}\)
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