Anionics with weakly basic cationics or amphoterics

2 Anionics with weakly basic cationics or amphoterics 

Some of these pairs occur fairly often others are somewhat improbable. There are two basic approaches, BEC titration and acid-base titration. 

BEC titration. Most mixtures of anionics with weakly basic cationics or amphoterics can be analysed by BEC titration in acid and alkaline solution. Two-phase titration is more satisfactory than potentiometric. Acid and alkaline have the same meanings as before. The measurements produced are shown in Table 8.3. 

This is more satisfactory for weakly basic cationics than for amphoterics, although the results with WW and WS amphoterics are usually considered reasonable for quality-control purposes. 

Acid-base titration. This is good for weakly basic cationics, and can be satisfactory for amphoterics provided that other weak acids and bases are not present at too high a concentration, or if the titration can be done in such a way as to nullify their effects (cf. [2] for carboxybetaines). 

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Table 8.3 Titration of mixtures of anionics with weakly basic cationics or amphoterics...

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