Determination of Activity Coefficients, Osmotic Coefficients, and Excess Gibbs Free Energies of KCl and KBr Aqueous Mixtures at 298.15 K

2018 ◽  
Vol 63 (2) ◽  
pp. 290-297
Author(s):  
Rahman Salamat-Ahangari ◽  
Laya Saemi Pestebaglu ◽  
Zohreh Karimzadeh
Keyword(s):  
Activity Coefficients ◽  
Osmotic Coefficients ◽  
Aqueous Mixtures ◽  
Free Energies ◽  
Determination Of Activity

Determination of water activity, osmotic coefficients, activity coefficients, solubility and excess Gibbs free energies of NaCl-sucrose-H2O mixture at 298.15 K

2019 ◽  
Vol 284 ◽  
pp. 492-501 ◽  
Author(s):  
Brahim Messnaoui ◽  
Abdelfetah Mounir ◽  
Abderrahim Dinane ◽  
Abderrahim Samaouali ◽  
Bahija Mounir
Keyword(s):  
Water Activity ◽  
Activity Coefficients ◽  
Osmotic Coefficients ◽  
Free Energies

Osmotic coefficients and activity coefficients of aqueous mixtures of sodium chloride and sodium carbonate at 25°C

1980 ◽  
Vol 33 (9) ◽  
pp. 1903 ◽  
Author(s):  
Jr DR White ◽  
RG Bates
Keyword(s):  
Sodium Chloride ◽  
Activity Coefficients ◽  
Sodium Carbonate ◽  
Osmotic Coefficients ◽  
Pitzer Equation ◽  
Aqueous Mixtures ◽  
Free Energies ◽  
Scatchard Equation ◽  
The Individual ◽  
Reference Electrolyte

Isopiestic vapour-pressure measurements have been used to determine the osmotic coefficients of aqueous mixtures of sodium chloride and sodium carbonate at 25°C. Solutions of sodium chloride were used as the reference electrolyte. The data served to evaluate the excess free energies of mixing as well as the mixing parameters of the Scatchard and Pitzer theories. The three-parameter form of the Scatchard equation accounts well for the experimental results, and the Pitzer equation with two adjustable parameters does equally well. The activity coefficients of the individual salts in the mixtures have been calculated.

NaCl and CaCl2 activity coefficients in mixed aqueous solutions

1965 ◽  
Vol 20 (6) ◽  
pp. 1332-1336 ◽  
Author(s):  
Edward W. Moore ◽  
James W. Ross
Keyword(s):  
Ionic Strength ◽  
Activity Coefficients ◽  
Technical Assistance ◽  
Osmotic Coefficients ◽  
Electrode System ◽  
Glass Electrode ◽  
Concentration Data ◽  
Harned's Rule ◽  
Potentiometric Measurement

In the investigation of numerous physiological phenomena it is the activity of an ion species which is desired, rather than stoichiometric concentration. The calculation of mean ionic activity from known concentration data requires accurate activity coefficients (ggr). This report concerns the determination of ggrNaCl and ggrCaCl2 in mixed NaCl-CaCl2 solutions by potentiometric measurement with a sodium-selective glass electrode-Ag/AgCl electrode system over the ionic strength range 0.05–0.5 m. Log ggrNaCl varied linearly, at constant total ionic strength, with the ionic strength of CaCl2 in the mixture, in accordance with Harned's rule. From data thus obtained, ggrCaCl2 coefficients in such mixed solutions have been calculated and compared with values calculated from published osmotic data. Resulting activity coefficient curves for ggrCaCl2 are presented over the concentration range encountered in serum and other extracellular fluids. Note: (With the Technical Assistance of Leonard Kaye and Leonard L. Anderson) glass electrodes; ion interaction; electrolyte metabolism; Harned's rule; membrane transport; osmotic coefficients Submitted on March 11, 1965

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