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A student needs to prepare a buffer solution of propanoic acid and its sodium salt with pH 4. The ratio of COOH CH CH ] COO CH CH [ 2 3 3 3 − required to make buffer is _____ . Given : Ka(CH 3 CH 2 COOH) = 1.3 × 10 –5

1. 0.03
2. 0.13
3. 0.23
4. 0.33 CAREER POINT CAREER POINT Ltd., CP Tower, IPIA, Road No.1, Kota (Raj.), Ph: 080-47250011 www.careerpoint.ac.in 14 JEE Main Online Paper

Correct answer: 0.13

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