A buffer solution is prepared by mixing 20 ml of 0.1 M C H 3 C O O H and 40 ml of 0.5 M C H 3 C O O N a and then diluted by adding 100 ml of distilled water. The pH of resulting buffer solution is (Given p K a C H 3 C O O H = 4.76 )

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Correct answer: A. 5.76

p H = p K a + log ⁡ s a l t a c i d = 4.76 + l o g 40 × 0.5 20 × 0.1 = 4.76 + 1 = 5.76 pH of a buffer does not change on dilution

A buffer solution is prepared by mixing 20 ml of 0.1 M C H 3 C O O H and 40 ml of 0.5 M C H 3 C O O N a and then diluted by adding 100 ml of distilled water. The pH of resulting buffer solution is (Given p K a C H 3 C O O H = 4.76 )

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