Viscosities of glycine and DL–alanine in water acetonitrile mixtures between 25 and 40 °C

1980 ◽  
Vol 58 (15) ◽  
pp. 1512-1515 ◽  
Author(s):  
Nibaran C. Dey ◽  
Birendra K. Saikia ◽  
Inamul Haque
Keyword(s):  
Apparent Molar Volumes ◽  
Molar Volumes ◽  
Increase With Increase ◽  
B Coefficients ◽  
Limiting Value

The relative viscosities and densities of glycine in 5%, 10%, 15%, and 20% w/w acetonitrile–water mixtures at 25, 30, 35, and 40 °C and of DL-alanine in water, 5%, 15%, and 20% w/w acetonitrile water mixtures at 30 and 40 °C have been determined. The viscosity B coefficients have been found to increase with increase in concentration of acetonitrile and also with the increase of temperature in both cases.The limiting apparent molar volumes and limiting value of effective flow volumes have also been calculated.

scholarly journals Density and Viscosity of LiCl, LiBr, LiI and Kcl in Aqueous Methanol at 313.15K

2021 ◽  
Vol 37 (5) ◽  
pp. 1083-1090
Author(s):  
V. V. Kadam ◽  
A. B. Nikumbh ◽  
T. B. Pawar ◽  
V. A. Adole
Keyword(s):  
Experimental Data ◽  
Dielectric Constant ◽  
Apparent Molar Volumes ◽  
Strong Electrolyte ◽  
Aqueous Methanol ◽  
Molar Volumes ◽  
Solvent Interactions ◽  
Viscosity Coefficients ◽  
Physicochemical Processes ◽  
Increase With Increase

The densities and viscosities of electrolytes are essential to understand many physicochemical processes that are taking place in the solution. In the present research, the densities and viscosities of lithium halides, LiX (X = Cl, Br, I ) and KCl in (0, 20, 40, 50, 60, 80 and 100) mass % of methanol + water at 313.15K were calculated employing experimental densities (ρ), the apparent molar volumes( ϕv) and limiting apparent molar volumes (0v) of the electrolytes. The (0v) of electrolyte offer insights into solute-solution interactions. In terms of the Jones-Dole equation for strong electrolyte solution, the experimental data of viscosity were explored. Viscosity coefficients A and B have been interpreted and discussed. The B-coefficient values in these systems increase with increase of methanol in the solvents mixtures. This implied that when the dielectric constant of the solvent decreases, so do the solvent-solvent interactions in these systems.

scholarly journals Volumetric, viscometric and refractive index behavior of amino acids in aqueous glycerol at different temperatures

2007 ◽  
Vol 72 (5) ◽  
pp. 495-512 ◽  
Author(s):  
A. Ali ◽  
S. Khan ◽  
F. Nabi
Keyword(s):  
Amino Acids ◽  
Mixed Solvents ◽  
Partial Molar Volumes ◽  
State Theory ◽  
Apparent Molar Volumes ◽  
Ternary Mixtures ◽  
Refractive Indices ◽  
Glycerol Solution ◽  
Molar Volumes ◽  
B Coefficients

Densities, ?, viscosities, ? and refractive indices, n D, of solutions of some amino acids (glycine, DL-alanine, DL-? -amino- n-butyric acid, L-valine and L-leucine) in the concentration range 0.02 to 0.10 m in 5 % (v/v) aqueous glycerol were determined at 298.15, 303.15, 308.15 and 313.15 K. These experimental data were used to calculate the apparent molar volumes, ? v, the infinite dilution apparent molar volumes, ? v 0, the partial molar volumes of transfer, ? v 0 (tr), of the amino acids from aqueous to aqueous glycerol solution, as well as the viscosity A and B coefficients of the Jones-Dole equation of the amino acids. The free energies of activation of viscous flow, ??1 0# and ?? 2 0# per mole of solvent and solute, respectively, were obtained by application of the transition-state theory to the B coefficient data and the corresponding activation enthalpy, ?H*, and entropy, ?S*, were also determined. The ? v 0, B coefficients and ?? 2 0# were found to vary linearly with increasing number of carbon atoms in the alkyl chain of the amino acids, and they were split into contributions from the zwitterionic end groups (NH3 +, COO-) and methylene (CH2) groups of the amino acids. The experimental values of the refractive indices, n D, were used to calculate the molar refractive indices, R D, of the amino acids + aqueous glycerol ternary mixtures. The results were interpreted in the light of the solute-solvent and solute-solute interactions in the mixed solvents.

Apparent molar volumes and viscosity B-coefficients of caffeine in aqueous thorium nitrate solutions at T=(298.15, 308.15, and 318.15)K

2010 ◽  
Vol 42 (3) ◽  
pp. 380-386 ◽  
Author(s):  
Biswajit Sinha ◽  
Pran Kumar Roy ◽  
Bipul Kumar Sarkar ◽  
Dhiraj Brahman ◽  
Mahendra Nath Roy
Keyword(s):  
Apparent Molar Volumes ◽  
Thorium Nitrate ◽  
Molar Volumes ◽  
B Coefficients ◽  
Nitrate Solutions

Apparent molar volumes and viscosity B-coefficients of some α-amino acids in aqueous solutions from 278.15 to 308.15K

1999 ◽  
Vol 334 (1-2) ◽  
pp. 17-27 ◽  
Author(s):  
Zhenning Yan ◽  
Jianji Wang ◽  
Wenbin Liu ◽  
Jinsuo Lu
Keyword(s):  
Amino Acids ◽  
Aqueous Solutions ◽  
Apparent Molar Volumes ◽  
Molar Volumes ◽  
B Coefficients
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