A buffer solution is prepared by mixing 10 ml of 1.0 M acetic acid and 20 ml of 0.5 M sodium acetate and then diluted to 100 ml with distilled water. If the pKa of CH3COOH is 4.76, what is the pH of the buffer solution prepared?
A
5.21
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B
4.76
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C
4.34
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D
2.52
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Solution
The correct option is B 4.76 Given, [CH3COOH]=1.0M,[CH3COONa]=0.5M volume of acetic acid = 10 ml volume of sodium acetate = 20 ml volume of distilled water = 100 ml Apply Henderson equation : pH=pKa+log[Salt][Acid] pH=pKa+log[CH3COONa][CH3COOH] pH=4.76+log(20×0.510) pH=4.76