A buffer solution contains 100 mL of 0.01 M CH3COOH and 200 mL of 0.02 M CH3COONa.700 mL of water is added. pH before and after dilution are (pKa = 4.74)

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5.04, 5.04

5.04, 0.504

5.04, 1.54

5.34, 5.34

answer is D.

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Detailed Solution

In mixture (before dilution )[CH3COOH]=0.01×100300=0.013M[CH3COONa]=0.02×200300=0.043MpH=pKa+log.[salt][acid]=4.74+log.0043×30.01=4.74+log4=4.74+0.60=5.34On dilution , no change in pH will take place.pH (before) = pKa + log 4 =5.34Dilution has no effect on pH of buffer.

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