What is the pH of a 0.1 M solution of acetic acid (pKa = 4.75)?

Explanation:

Hello,

In this case, since dissociation of acetic acid is:

The equilibrium expression in terms of the acid dissociation constant is:

In such a way, in terms of the reaction extent, we write:

And Ka is computed from the pKa:

Thus, solving for we obtain:

Which is also equal to the concentration of H⁺ so the pH is:

Regards.

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