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19/10/2021 9:52 am
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For preparing a buffer solution of pH 6 by mixing sodium acetate and acetic acid, the ratio of the concentration of salt and acid should be (Ka = 10-5)
(a) 1 : 10
(b) 10 : 1
(c) 100 : 1
(d) 1 : 100
1 Answer
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19/10/2021 9:55 am
Correct answer: (b) 10 : 1
Explanation:
6 = -log 10-5 + log\(\frac{salt}{acid}\) = 5 + log \(\frac{salt}{acid}\)
log\(\frac{salt}{acid}\)must be 1.
∴ \(\frac{salt}{acid}\) = \(\frac{10}{1}\) or 10 : 1.