Let's rearrange this equilibrium expression to solve for [H+}

HOAc H+ + OAc-

K = 1.8x10-5 =

[H+][OAc-]


[HOAc]

[H+] = K

[HOAc]


[OAc-]

This says that the hydrogen ion concentration, [H+] is
proportional to the [HOAc] / [OAc-] ratio.

Next, let's explore what happens if we add a little acid or base.


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