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pKa and pH are not really the same thing, however, they work very similarly. The p in front of the Ka and [H+] just means to take the negative log of whatever comes after. So its the negative log of Ka and [H]. The method to turn pKa and pH are just about the same, you would just do 10^neg of either one to get the Ka or [H]. With Ka and [H+], you can find Kb and [OH-] via the Kw.
Basically, Ka is the equilibrium constant for acid ionization (a large Ka indicates a stronger acid that has dissociated completely) and correlates with a high concentration of H+. pKa and pH are just simpler ways of expressing this by taking the -log of each.
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