Question

Calculate the ph of a solution that is 0.230 m in sodium formate (hcoona) and 0.100 m in formic acid (hcooh).

Answer 1

Hello!

The pH of the solution is 4,13

This solution is a typical example of a buffer solution, in which a weak acid and its conjugate base are together and resists the addition of acids or bases. For calculating the pH of a buffer solution, we use the Henderson-Hasselbach equation, which is the following:

$pH=pKa+log( \frac{ [A^{-}]}{[HA]}) \\ \\ pH=3,77+log (\frac{0,230M}{0,100M})\\ \\ pH= 4,13$

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