Acidity
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Re: Acidity
From Ka, you can find the pKA. pKa and PH are related with the Henderson-Hasselbalch equation: pH = pKa + log ([A–] / [HA]), where [A-] is the concentration of the conjugate base, and [HA] is the concentration of the acid.
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Re: Acidity
You could also solve it by finding the equilibrium concentrations of the molecules in the solution and then setting it equal to the K value. You then solve normally by usually having to find an x value at equilibrium, but ultimately you should be able to find either the H3O+ concentration or the OH- concentration which you can then use to find pH
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Re: Acidity
If you are given Ka, you can solve for the pH by making an equilibrium equation HA <-> H+ + A- and use an ICE table given the molarity of the acid to solve for the concentration (x) of the hydronic ion, which can then be plugged into -log[H+] = pH.
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