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25 September, 14:31

What is the best buffer at pH = 5.0? Justify your answer.

a) Formic acid (pKa = 3.8)

b) acetic acid (pKa = 4.76)

c) ethylamine (pKa = 9.0)

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  1. 25 September, 14:45
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    b) acetic acid (pKa = 4.76)

    Explanation:

    Considering the Henderson - Hasselbalch equation for the calculation of the pH of the buffer solution as:

    pH=pKa+log[base]/[acid]

    The weak acid for making the buffer must have a pKa value near to the desired pH of the weak acid.

    So, near to value, pH = 5, acetic acid is close which have of pKa of 4.76

    Thus, option B is correct.
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