If a propanoic acidpropanoate buffer is 020m in propanoic, Chemistry

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If a propanoic acidpropanoate buffer is 020m in propanoic

A. If a propanoic acid/propanoate buffer is .020M in propanoic acid and has a pH of 4.63, what is the molar concentration of the propanoate ion? The pKa of propanoic acid is 4.89.

B. If a butyric acid/butyrate buffer is 0.030 M in butyric acid and has a pH of 4.5, what is the molar concentration of butyrate ion? The pKa of butyric acid is 4.81.

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