K a for butyric acid C 3 H 7 COOH is 2 × 10 - 5 . The pH of 0 . 2 M solution of butyric acid is____ × 10 - 1 . (Nearest integer) [Given log 2 = 0 . 30 ]

Question

K a for butyric acid C 3 H 7 COOH is 2 × 10 - 5 . The pH of 0 . 2 M solution of butyric acid is____ × 10 - 1 . (Nearest integer) [Given log 2 = 0 . 30 ],

MARKS App · Accepted Answer

K a of Butyric acid ⇒ 2 × 10 - 5 pK a = - logK a = 4 . 7 pH of weak acid solution pH = 1 2 pK a - 1 2 logC = 1 2 4 · 7 - 1 2 log 0 . 2 = 2 . 35 + 0 . 35 = 2 . 7 pH = 27 × 10 - 1

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