pH vs pKa in Equilibrium

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Ayesha Aslam-Mir 3C
Posts: 112
Joined: Wed Sep 30, 2020 9:43 pm

pH vs pKa in Equilibrium

Postby Ayesha Aslam-Mir 3C » Sun Jan 24, 2021 2:29 am

kind of an old content question but how can we determine whether a reaction favors reactants or products based on how the pH compares to the pKa/pKb when lokoing at acid/base dissociation?

Fiona Huang 3C
Posts: 42
Joined: Wed Nov 25, 2020 12:19 am

Re: pH vs pKa in Equilibrium

Postby Fiona Huang 3C » Sun Jan 24, 2021 4:17 am

Hi! If the pH is higher than the pKa for acids, it would want to be more acidic, so it would produce more protons (H3O+), and therefore favor the products. And if the pH is lower than the pKa, it would produce more HA and favor the reactants. For bases, I think that it would be the opposite. If pH is higher than pKa, the reactants (B and H2O) would be favored. And if pH is lower, the products (BH+ and OH-) would be favored.


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