Calculate the ph of a solution that is 0.245m benzoic acid and 0.170m sodium benzoate, a salt whose anion is the conjugate base of benzoic acid.

Hello!

A solution of a weak acid and its conjugate base is called a buffer solution. It can resist the addition of bases and acids while maintaining the pH approximately constant. 

To calculate the pH of a buffer solution, we'll use the famous Henderson-Hasselbach equation, applying the pKa value of the Benzoic Acid (4,20). In this equation, [A⁻] represents the concentration of the Conjugate Base and [HA] the concentration of the acid.



So, the pH of the solution would be 4,04.

Have a nice day!

Ais stronge

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