Open AccessThermodynamic function of valineacid in n-n dimethyl formamide mixtures from conductance measurement
Author(s) -
Sanaa T. Sarhan
Publication year - 2013
Publication title -
mağallaẗ baġdād li-l-ʿulūm
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.167
H-Index - 6
eISSN - 2411-7986
pISSN - 2078-8665
DOI - 10.21123/bsj.10.4.1172-1181
Subject(s) - chemistry , enthalpy , thermodynamics , dimethyl formamide , formamide , solvent , conductance , atmospheric temperature range , dissociation constant , dissociation (chemistry) , entropy (arrow of time) , organic chemistry , biochemistry , physics , receptor , mathematics , combinatorics
Some physical properties enthalpy (?H), entropy (?s), free energy (?G),capacities(?cp?) and Pka values) for valine in dimethyl foramideover the temperature range 293.15-318.15K, were determined by direct conductance measurements. The acid dissociation at six temperature was examined at solvent composition x2) involving 0.141 of dimethyl foramide . As results, calculated values have been used to determine the dissociation constant and the associated thermodynamic function for the valine in the solvent mixture over temperatures in the range 293.15-318.15 k. The Pka1, and Pka2 were increased with increasing temperature.