How does pKa change with pH?

1 Answer
Feb 18, 2016

#pH = pK_a + log (A^-#/HA)


#pH = pK_a + log (A^-#/HA)
pKa is an equilibrium constant. pH is an indication of hydrogen ion content in a solution. Any changes to pH will therefore affect one of the factors in the pKa equation. The amount and direction of change in the pKa value will depend on whether the #H^+# ions are part of the reactant or product side of the equation.