Chemistry Reference
In-Depth Information
3
Potentiometric Study on
the Interactions between
Divalent Cations and
Sodium Carboxylates in
Aqueous Solution
Rui F. P. Pereira, Artur J. M. Valente,
Hugh D. Burrows, and Victor M. M. Lobo
CONTENTS
3.1 Introduction ....................................................................................................... 23
3.2 Experimental...................................................................................................... 24
3.3 Discussion and Results ...................................................................................... 25
3.4 Conclusion ......................................................................................................... 31
Keywords ................................................................................................................... 31
Acknowledgment ....................................................................................................... 31
References .................................................................................................................. 31
3.1 INTRODUCTION
The interaction of cations with anionic surfactants in aqueous solutions is of both
considerable theoretical [1-5] and practical [6, 7], importance, and can have dramatic
effects on the mixed solution phase behavior. The factors responsible for the forma-
tion of aggregates by amphiphilic molecules in aqueous solutions are well established
[6-9], and there is a vast literature of experimental data which supports theoretical
predictions.
The charge of these cations suggests that they are likely to bind anions strongly. In
addition, aqueous solutions, metal ions are susceptible to hydrolysis [10], which can
lead to particularly rich phase behavior. Various methods have been used to study the
interaction of cations with anionic surfactants, including surface tension [11-13], elec-
trical conductivity [14-16], potentiometry [17, 18], nuclear magnetic resonance [19,
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