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# Calculate the pH of a weak acid (acetic acid)

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Given the Ka value of acetic acid is 1.8e-5, find the pH of a 0.25M acetic acid solution. Also find its Kb value.

https://brainmass.com/chemistry/acids-and-bases/calculate-the-ph-of-a-weak-acid-acetic-acid-73988

#### Solution Preview

3. Calculate the pH of 0.25 M HOAc.
Describe the dissociation of the acid as follows.

HOAc(aq) + H2O(l) &#8596; H3O+ (aq) + OAc-(aq)
Initial 0.25 M 0.25 ...

#### Solution Summary

The solution provides detailed explanations on the concept of weak acid dissociation equilibrium and step-by-step calculations.

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