pH- from saturday

i posted this question previously and got help however im still having some confusion. can u clarify ?

what's the pH of the acid HC2H3O2 with concentration of .15?

Bob Pursley worked that problem for you and gave it as
[x^2/0.15] = Ka.
What is it you don't understand? You know Ka, solve for x which is H^+, and convert to pH.

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