JEE Main 2022 · 28 Jul · Shift 1 · Chemistry Q85

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ChemistryInteger+4 / -1Question 85 of 90

$K_a$ for butyric acid $(\mathrm{C_3H_7COOH})$ is $2\times10^{-5}$ . The pH of 0.2 M solution of butyric acid is ______ $\times10^{-1}$ . (Nearest integer)

[Given log 2 = 0.30]

Your answer

Answer and worked solution

Official answer: 27

$[\mathrm{H^+}]=\sqrt{K_aC}$ $=\sqrt{4\times10^{-6}}=2\times10^{-3}$ , so pH $=3-0.30=2.7$ .

Answer: 27

Topics:pH and ionisation

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JEE Main 2022 · 28 Jul · Shift 1, Chemistry question 85