Micellar effects in the kinetics of reaction between phenolphthalein and hydroxide ion. (1) The effect of nonionic and anionic surfactants
DOI:
https://doi.org/10.26565/2220-637X-2013-22-14Keywords:
surfactant, micelle, phenolphthalein, fading reaction, rate constantAbstract
The rate constant of phenolphthalein and hydroxide ion reaction were obtained in the systems: ethanol – Brij-35 (nonionic surfactant), ethanol – SDS (sodium dodecyl sulfate, anionic surfactant), Brij-35 – SDS, Brij-35, Triton Х-100 (nonionic surfactant), Triton Х-100 – Brij-35, Triton Х-100 – SDS. It was found that the increase of nonionic surfactant concentration leads to the decrease of the rate constant. The increase of pure SDS micelles concentration and fraction of SDS in mixed SDS – Brij-35, SDS – Triton Х-100 micelles leads to the slight decrease of the rate constant. Such dependencies can be explained by the decrease of the effective concentration of the dye in the nonionic surfactant micelles and hydroxyl ions repulsion from charged surface of anionic surfactant micelles.
References
Khan M. N. Micellar catalysis. – Boca Raton: CRC Press, 2007. – 482 p.
Duynstee E. F. G., Grunwald E. // J. Am. Chem. Soc. – 1959. – Vol. 81. – P. 4540–4542.
Samiey B., Toosi A.R. // Bull. Korean Chem. Soc. – 2009. – Vol. 30, No. 9. –P. 2051–2056.
Samiey B., Dargahi M.R. // Reac. Kinet. Mech. Cat. – 2010. – 101. – P. 25–39.
Samiey B., Alizadeh K., Moghaddasi M. A., Mousavi M. F., Alizadeh N. // Bull. Korean Chem. Soc. – 2004. – Vol. 25, No. 5. – P.726–736.
Chen D T. Y., Laidler K. J. // Can. J. Chem. – 1959. – Vol. 37, No. 3. – P.599-642.
Mao Sh., Chen Zh., An X., Shen W. // J. Phys. Chem A. – 2011. – Vol. 115, No. 22. – P. 5560–5567.
Mao Sh., Chen Zh., Fan D., An X., Shen W. // J. Phys. Chem A. –2012. –Vol. 116, No. 2. – P. 158–165.
Berezin I. V., Martinek K., Yatsimirskiy A. K. // Uspehi himii. – 1973. – Vol. 52, No. 10. – P. 1729-1756. [in Russian]
Reichardt Chr., Welton T. Solvents and Solvent Effects in Organic Chemistry. – Weinheim: WILEY-VCH, 2011. – 692 p.
