We have already come across one example of the qualitative application of acid–base titrimetry in assigning the forms of alkalinity in waters (see Example 9.5).
This approach is easily extended to other systems. For example, the composition of solutions containing one or two of the following species
can be determined by titrating with either a strong acid or a strong base to the methyl orange and phenolphthalein end points. As outlined in Table 9.11, each species or mixture of species has a unique relationship between the volumes of titrant needed to reach these two end points.