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E-Journal of Chemistry
Volume 6 (2009), Issue 2, Pages 561-568

Protonation Equilibria of L-Aspartic, Citric and Succinic Acids in Anionic Micellar Media

P. Srinivasa Rao, B. Srikanth, V. Samba Siva Rao, C. Kamala Sastry, and G. Nageswara Rao

School of Chemistry, Andhra University, Visakhapatnam-530 003, India

Received 13 October 2008; Accepted 12 December 2008

Copyright © 2009 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The impact of sodium lauryl sulphate (SLS) on the protonation equilibria of L-aspartic acid, citric acid and succinic acid has been studied in various concentrations (0.5-2.5% w/v) of SLS solution maintaining an ionic strength of 0.16 mol dm-3 at 303 K. The protonation constants have been calculated with the computer program MINIQUAD75 and the best fit models have been calculated based on statistical parameters. The trend of log values of step-wise protonation constants with mole fraction of the medium has been explained based on electrostatic and non-electrostatic forces operating on the protonation equilibria. The effects of errors on the protonation constants have also been presented.