# How do you determine pH at an equivalence point?

##### 1 Answer

Mar 18, 2014

When all of a weak acid has been neutralized by strong base, the solution is essentially equivalent to a solution of the conjugate base of the weak acid.

For example, if a 0.2 M solution of acetic acid is titrated to the equivalence point by adding an equal volume of 0.2 M NaOH, the resulting solution is exactly the same as if you had prepared a 0.1 M solution of sodium acetate.

The pH of 0.1 M sodium acetate is calculated as follows:

x =

pOH = -log(

pH = 14 - pOH = 8.87