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Q.

A buffer solution is prepared by mixing 10 mL of 1.0 M CH3COOH and 20 mL of 0.5 m CH3COONa and then diluted to 100 mL with distilled water. If pKa of CH3COOH is 4.76. What is the pH of the buffer solutions?

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answer is 5.

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Detailed Solution

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Total volume =100Ml 

acid=10mL×1.0100=0.1, salt=20mL×0.5100=0.1

pH of acidic buffer =pKa+logsaltacid=4.76+log0.10.1=4.76

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