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The mixing effect of glycine with sodium chloride from activity coefficients investigations at T = (303.15 and 313.15) K

F. SIRBU1,* , O. IULIAN2

Affiliation

  1. Institute of Physical Chemistry “Ilie Murgulescu” of the Romanian Academy, 202 Splaiul Independenţei str., P. O. Box 12-194, 060021 Bucharest, Romania
  2. Polytechnica University of Bucharest, Faculty of Applied Chemistry and Material Science, 1-7 Gh. Polizu str., P.O. Box 12-134, 011061, Bucharest, Romania

Abstract

The mixing effect of electrolyte and aminoacid on activity coefficients in NaCl+Glycine+Water mixtures, for molality of glycine and NaCl up to 2 mol kg-1 was investigated. The activity coefficients at (303.15 and 313.15) K of NaCl and glycine in aqueous solutions were measured using potentiometric method. The obtained experimental data were fitted by ScatchardPrentiss and Roberts-Kirkwood equations. The mean ionic activity coefficient of NaCl decreases as the molality of glycine in the solution increases. The presences of NaCl diminish the activity coefficient of glycine giving a salt-in effect for amino acid..

Keywords

Mixing effect, Potentiometric method, NaCl, Glycine, NaCl.

Submitted at: March 3, 2010
Accepted at: May 26, 2010

Citation

F. SIRBU, O. IULIAN, The mixing effect of glycine with sodium chloride from activity coefficients investigations at T = (303.15 and 313.15) K, Journal of Optoelectronics and Advanced Materials Vol. 12, Iss. 5, pp. 1200-1205 (2010)