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Equivalence point for titrations


Chemistry tutor NYC

Titration is a lab technique where a known acid/base is added to unknown acid or base to find out its molarity. When stoichiometrically moles of acid are equal to moles of base, the equivalence point has been reached.

A common question about the equivalence point is to find the pH of solution at that point. Let's break our titration into three categories.

Strong acid with strong base titration:

When a strong acid reacts with a strong base, water and neutral salt is created. The equivalence point of the strong acid/strong base titration has a pH of 7.

Strong acid with weak base titration:

When a strong acid reacts with weak base, water and acidic salt is produced. At equivalence point, all of strong acid and weak base is gone. However, since through the reaction, weak conjugate acid is produced, pH at the equivalenc