Like pH is the log of [H+] concentration, pKa is the log of Ka (acid dissociation constant)
Ka= products/reactants
PKa= -log(Ka)
Ka = 10^(-pKa)
Weak acids do not fully dissociate, so you must work out Ka for the reaction. Concentration of the two products is the same so square the h+ concentration, and divide by the reactants e.g.
ka = [H+]^2 / [reactants]
If you are looking for H+ concentration, to find pH, you:
[H+] = square root (Ka x [reactants]
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