Activity coefficient assumptions in the determination of the association constant of thallium(I) chloride. III. Effects of other association reactions

1967 ◽  
Vol 20 (12) ◽  
pp. 2633 ◽  
Author(s):  
KH Khoo ◽  
MH Panckhurst
Keyword(s):  
Activity Coefficient ◽  
Sodium Acetate ◽  
Association Constant ◽  
Specific Interaction ◽  
Mixed Solvents ◽  
Sodium Perchlorate ◽  
Barium Chloride ◽  
Interaction Coefficients ◽  
Free Ions

Measurements are reported of the solubility of thallium(I) chloride in aqueous solutions of sodium acetate and thallium(I) perchlorate and in solutions of sodium chloride, barium chloride, and sodium perchlorate in 16.7, 30, and 60 wt. % methanol-water mixtures. The measurements in water are used to test the merits of two types of ionic activity coefficient expression. It is shown that it is necessary to take account of specific interactions between free ions and that this also allows for small amounts of other association reactions in the same solution. The possibility of allowing for subsidiary association without using specific interaction coefficients is discussed, and it is concluded that this cannot be done in a completely satisfactory way. Measurements in mixed solvents are used to determine association parameters for the complex TlCl.

Activity coefficient assumptions m the determination of the association constant of thallons chloride. II. Effect of interactions between freeions

1966 ◽  
Vol 19 (6) ◽  
pp. 915 ◽  
Author(s):  
JB Macaskill ◽  
MH Panckhurst
Keyword(s):  
Sodium Chloride ◽  
Activity Coefficient ◽  
Association Constant ◽  
Sodium Perchlorate ◽  
Barium Chloride ◽  
Specific Interactions ◽  
Ionic Activity ◽  
Caesium Chloride ◽  
Free Ions

The solubility of thallous chloride has been measured in solutions of hydrochloric acid, caesium chloride, caesium perchlorate, barium chloride, and in various mixtures of sodium chloride and sodium perchlorate. These measurements are analysed to give the association constant for thallous chloride, paying particular attention to ionic activity coefficient formulae. It is shown that an activity coefficient expression which assumes no specific interactions between free ions is unsatisfactory in contrast to an expression which assumes such interactions. The consequences of this are discussed.

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

1969 ◽  
Vol 22 (5) ◽  
pp. 911 ◽  
Author(s):  
CW Childs ◽  
MH Panckhurst
Keyword(s):  
Activity Coefficient ◽  
Sodium Acetate ◽  
Specific Interaction ◽  
Sodium Perchlorate ◽  
Potassium Bromide ◽  
Association Constants ◽  
Sodium Bromide ◽  
Specific Interactions ◽  
Free Ions

Measurements are reported of the solubility of thallium(I) bromide in aqueous solutions of potassium bromide, sodium perchlorate, barium bromide, and of mixtures of sodium bromide and sodium perchlorate and of sodium bromide and sodium acetate at 25�. The measurements are used to test the merits of two types of ionic activity coefficient expressions, one assuming specific interactions between free ions and the other not. It is shown that neither expression can describe our results adequately, in contrast to previous solubility results with thallium(I) chloride for which the specific interaction expression was adequate.

Activity coefficient assumptions in the determination of the association constant of thallous chloride

1964 ◽  
Vol 17 (5) ◽  
pp. 522 ◽  
Author(s):  
JB Macaskill ◽  
MH Panckhurst
Keyword(s):  
Sodium Chloride ◽  
Ionic Strength ◽  
Activity Coefficient ◽  
Association Constant ◽  
Specific Interaction ◽  
Sodium Perchlorate ◽  
Ionic Activity ◽  
Different Types

The solubility of thallous chloride has been measured in sodium chloride and sodium perchlorate solutions at an ionic strength less than 0 1M. The association constant of thallous chloride has been determined from these measurements using two different types of ionic activity coefficient expression, one of them incorporating Br�nsted's principle of specific interaction. The method for determining the association constant gives all the parameters in the treatment but the two activity coefficient expressions give different sets of parameters. These are discussed.

scholarly journals A Comparison of Methods for the Determination of Cation Exchange Capacity of Soils/Porównanie Metod Oznaczania Pojemności Wymiany Kationów I Sumy Kationów Wymiennych W Glebach

2014 ◽  
Vol 21 (3) ◽  
pp. 487-498 ◽  
Author(s):  
Dawid Jaremko ◽  
Dorota Kalembasa
Keyword(s):  
Organic Matter ◽  
Cation Exchange ◽  
Cation Exchange Capacity ◽  
Sodium Acetate ◽  
Calcareous Soils ◽  
Acid Soils ◽  
Barium Chloride ◽  
Exchange Capacity ◽  
Organic Carbon Content

Abstract The object of this study was to compare the results obtained with four methods of determination of cation exchange capacity (CEC) and sum of exchangeable cations (Ca, Mg, K) in soils. One of these methods is Kappen’s method and the others methods are based on different extracting reagents: sodium acetate (pH = 8.2), barium chloride and hexaamminecobalt(III) chloride. Values measured with barium ions and hexaamminecobalt(III) ions as index cations are very comparable and these two methods can be considered as equivalent. Kappen’s method gives overestimated results, especially for acid soils reach in organic matter and very calcareous soils. Sodium acetate, buffering the pH of the extracting solution, causes increase of numbers of negatively charged sites and particularly those bonded to organic matter and for this reason values obtained with this method are overestimated. Nevertheless, it is possible to correct this error for a given soil sample by regression equation considering pH of soil, clay and organic carbon content.

Activity coefficient assumptions in the determination of association constants. VII. Explicit assumptions in the analysis of solubility and absorbance measurements on thallium(I) chloride and bromide

1972 ◽  
Vol 25 (2) ◽  
pp. 317 ◽  
Author(s):  
CY Chan ◽  
MH Panckhurst
Keyword(s):  
Activity Coefficient ◽  
Interaction Coefficient ◽  
Association Constants ◽  
Halide Ions ◽  
Ionic Interaction ◽  
Interaction Coefficients ◽  
Ionic Activity ◽  
Common Ion ◽  
Absorbance Data

In an attempt to resolve discrepancies between association constants obtained from solubility and absorbance measurements for thallium(1) chloride and bromide the explicit assumptions used in the various analyses have been considered in detail. It is shown that the discrepancies can be accounted for in part by considering the activity coefficient of the complex TlCl or TIBr, and, more importantly, by allowing for the presence of small amounts of higher complexes in analysing absorbance data. It is also shown, in determining association constants using a specific ionic activity coefficient expression, that uncertainties in some interaction coefficients reduce the usefulness of our solubility measurements in non-common ion salts. In particular, it is concluded, using the specific ionic interaction coefficient expression, that association constants can at present only be arrived at from solubility measurements by specifying arbitrary interaction coefficients for thallium(1) and halide ions; and to obtain association constants using a non-specific ionic activity coefficient expression it is necessary to assume unnecessarily arbitrary subsidiary association reactions as well as an arbitrary value for the activity coefficient parameter B.

Activity coefficient assumptions in the determination of the association constant of thallium(I) chloride. IV. Spectrophotometric measurements on thallium(I) chloride solutions

1969 ◽  
Vol 22 (2) ◽  
pp. 317 ◽  
Author(s):  
JB Macaskill ◽  
MH Panckhurst
Keyword(s):  
Activity Coefficient ◽  
Aqueous Solutions ◽  
Association Constant ◽  
Association Constants ◽  
Chloride Solutions ◽  
Optical Absorbance ◽  
Different Types

Precise measurements are reported of the optical absorbance of aqueous solutions of thallium(I) chloride in mixture with other electrolytes at 25�. Two types of activity coefficient expressions are used to analyse the measurements in terms of association of thallium(I) chloride. The method of analysis is similar to that used for solubility measurements1-3 and the different types of measurements lead to different values for the association constants.

A New Volumetric Method for the Estimation of Sodium

1930 ◽  
Vol 20 (4) ◽  
pp. 511-516 ◽  
Author(s):  
A. Blenkinsop
Keyword(s):  
Sodium Acetate ◽  
Volumetric Method ◽  
Chemical Reagents ◽  
Mixed Solutions ◽  
Calcium Magnesium

1. A volumetric method for the determination of sodium which can be separated as a triple salt (uranium zinc sodium acetate) from mixed solutions is described. The reduction of the uranium with titanous chloride, upon which it depends is shown to be quantitative.2. Calcium, magnesium, and relatively large proportions of potash do not interfere. The procedure for the removal of iron, aluminium and phosphates by gentle ignition is simple and obviates the risk of error by the introduction of sodium as an impurity in the chemical reagents necessary for precipitation methods.3. 0.1 mg. of sodium can be determined accurately.

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