The Association Constants of H+ and Ca2 + with 2-Keto-D-Gluconate in Aqueous Solutions

2005 ◽  
Vol 34 (7) ◽  
pp. 789-800 ◽  
Author(s):  
Julia B. Nelson ◽  
Michael E. Essington
Keyword(s):  
Aqueous Solutions ◽  
Association Constants

scholarly journals Spectroscopic study of associated systems formed between water-soluble cationic porphyrins or their copper (II) complexes and nucleic building blocks

2013 ◽  
Vol 11 (8) ◽  
pp. 1360-1367 ◽  
Author(s):  
Magdalena Makarska-Bialokoz
Keyword(s):  
Aqueous Solutions ◽  
Spectroscopic Study ◽  
Curve Fitting ◽  
Building Blocks ◽  
Association Constants ◽  
Water Soluble ◽  
Cationic Porphyrins ◽  
Fitting Procedure ◽  
Vis Spectroscopy ◽  
Order Of Magnitude

AbstractThe association process between two water soluble cationic porphyrins, 5,10,15,20-tetrakis[4-(trimethyl-ammonio)phenyl]-21H,23H-porphine tetra-p-tosylate (H2TTMePP) and 5,10,15,20-tetrakis(1-methyl-4-pyridyl)-21H,23H-porphine tetra-p-tosylate (H2TMePyP), as well as their Cu (II) complexes, with five series of nucleic agents has been studied using UV-VIS spectroscopy in aqueous solutions. During the titration with nucleic compounds the bathochromic effect of porphyrins absorption spectra can be observed as well as the hypochromicity of the Soret maximum. The association constants were calculated using a curve-fitting procedure (KAC of the order of magnitude of 103–105 mol−1). It has been shown that the interactions of H2TTMePP with nucleic agents are much stronger than interactions of H2TMePyP, which is most likely related to the kind and the size of the porphyrin substituent groups partaking in the process of stacking. The strength of the observed associated systems increases generally in a series: nucleic base

THE LIMITING CONDUCTANCE OF AQUEOUS SOLUTIONS OF POTASSIUM IODATE, POTASSIUM CHLORATE, AND SILVER NITRATE AT 35.00 °C

1959 ◽  
Vol 37 (5) ◽  
pp. 889-892 ◽  
Author(s):  
E. Bock ◽  
A. N. Campbell
Keyword(s):  
Aqueous Solutions ◽  
Silver Nitrate ◽  
Association Constants ◽  
Potassium Chlorate ◽  
Potassium Iodate ◽  
Extrapolation Procedure ◽  
Limiting Equivalent Conductances

Measurements have been made of the equivalent conductances of aqueous solutions of potassium iodate, potassium chlorate, and silver nitrate at 35.00 °C at concentrations ranging from 0.8 × 10−4 to 16×10−4 N. From these, the limiting equivalent conductances and association constants A as obtained by the use of the Fuoss–Shedlovsky extrapolation procedure were found to be at 35.0 °C:[Formula: see text]

scholarly journals Conductometric Study of Nimesulide in Aqueous Solutions of Hydrotropic Agents at Different Temperatures

2012 ◽  
Vol 9 (1) ◽  
pp. 21-26 ◽  
Author(s):  
Chandravir S. Solanki ◽  
Paresh Mishra ◽  
Mahesh Kumar Talari ◽  
Minaketan Tripathy ◽  
Upendra N. Dash
Keyword(s):  
Aqueous Solutions ◽  
Thermodynamic Parameters ◽  
Sodium Benzoate ◽  
Sodium Salicylate ◽  
Molar Conductance ◽  
Association Constants ◽  
Sodium Bromide ◽  
Limiting Molar Conductance ◽  
Different Temperatures ◽  
Conductometric Study

Conductance values of nimesulide have been determined in water in 0.1, 0.2, 0.4, 0.6, 0.8, 1 and 2 mol dm-3aqueous solutions of hydrotropic agents (sodium benzoate, sodium salicylate, sodium bromide and nicotinamide) at temperatures 298.15, 303.15, 308.15 and 313.15 K. The conductance values have been used to evaluate the limiting molar conductance and association constants by means of Shedlovsky extrapolation technique. Thermodynamic parameters for the association process of nimesulide in aqueous solutions of hydrotropic agents have also been calculated.

Activity coefficient assumptions in the determination of association constants. VI. Association of thallium(I) bromide from absorbance measurements

1972 ◽  
Vol 25 (2) ◽  
pp. 311 ◽  
Author(s):  
CY Chan ◽  
MH Panckhurst
Keyword(s):  
Activity Coefficient ◽  
Aqueous Solutions ◽  
Association Constants ◽  
Experimental Results ◽  
Ionic Activity ◽  
Optical Absorbance ◽  
Different Types ◽  
Reasonable Description

Measurements are reported of the optical absorbance of aqueous solutions of thallium(I) bromide in mixture with other electrolytes a t 25°. These measurements are similar to those previously reported1 for thallium(I) chloride and are used in conjunction with two different types of ionic activity coefficient expressions to investigate association of thallium(I) bromide. Both types of expression give a reasonable description of the experimental results but there is the same disagreement with the analysis of solubility measurements found for thallium(1) chloride.

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