An important thought

However, there are problems associated with curve fitting procedures, not least those associated with the possibility that more than one best fit is possible. 

It is also crucially important that there is full awareness of what is going on physically and chemically in any given situation, be it a weak acid on its own in water or a bufifer made up from a polybasic acid and its salt. 

This is precisely why the analysis is set out in full for each case being considered in this chapter and others. There is no point in obtaining pKs or actual concentrations of species present in an aqueous solution if it is not known what is going on chemically in that solution. 

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