Study on the state of certain protonated amines in sodium dodecylsulfate solutions

Abstract

The effect of sodium dodecylsulfate (SDS) on acid-base properties of ammonia, hydrazine, and o- and p-phenylenediamine (o- and p-Pn) was studied at 308 K with potentiometric titration. The DS- anions were found to form strong associates p-PnH2(DS)2 with logKas = 7.8 ± 0.10. Monocations of o- and p-Pn are associated with SDS micelles through substitution of sodium counterions. Conclusions are made on the conditions for premicellar association of dodecylsulfate with various cations. © 1996 MAK Haya/Interperiodica Publishing.