Interpretation of pH titration curves

The equivalence point may be at a pH either above or below 7.0, depending on what the acid and the base are 

The equivalence point for a weak acid will always occur at basic pH values, e.g. pH = 8.14 for the case quoted. This reflects the basic behaviour of the salt formed, in contrast to the neutral behaviour of NaCl in the strong acid/strong base titration. Furthermore, the change in pH around the equivalence point is much less dramatic, again reflecting the fact that the salt formed is involved in an acid/base equiUbriiun. The buffer region shows a smooth increase in pH with addition of strong base. 

05 X 10 moldm. This does not suggest a buffer solution. 

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The previous discussions on salts of a strong acid/strong base, weak acid/strong base, weak base/strong acid, weak acid/weak base and buffers form the basis of the interpretation of pH titration curves. Although neutralisation and acid/base behaviour have some features in common, i.e. they both involve acid/base behaviour and both are proton transfer reactions, distinctions must be drawn between them. 

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