Specific ionic interactions and solubility activity product of caesium perrhenate at 298.10 K

1978 ◽  
Vol 31 (7) ◽  
pp. 1411 ◽  
Author(s):  
C Chan ◽  
KH Khoo ◽  
MH Panckhurst
Keyword(s):  
Activity Coefficient ◽  
Aqueous Solutions ◽  
Specific Interaction ◽  
The Other ◽  
Interaction Parameters ◽  
Ionic Interactions ◽  
Aqueous Mixtures ◽  
Ionic Interaction ◽  
Ionic Activity ◽  
Activity Product

The solubilities of caesium perrhenate in aqueous CsCl, NaCl, KCl and KReO4 solutions at 298.10 K are reported. The solubility activity product for CsReO4 was determined by using extrapolation functions involving two different mean ionic activity coefficient expressions and the results were compared; the total ionic strengths of all the saturated perrhenate solutions were less than 0.1 mol dm-3. One of these expressions used is that proposed recently by Panckhurst and Macaskill1,2 which is an extension of Guggenheim's approach,3,4 specific ionic interactions in aqueous solutions being explicitly taken into account. Its use led to more consistent values for the solubility activity product for CsReO4 than those obtained with the other expression which does not incorporate specific interaction parameters. Values of specific ionic interaction parameters for caesium, potassium and sodium perrhenates in dilute aqueous mixtures with CsCl, KCl, KReO4, KI or NaCl are also reported.

Activity coefficients of potassium perrhenate in aqueous mixtures with KCl, NaCl and KI at 298.15 K

1975 ◽  
Vol 28 (3) ◽  
pp. 665 ◽  
Author(s):  
C Chan
Keyword(s):  
Activity Coefficient ◽  
Aqueous Solutions ◽  
Activity Coefficients ◽  
Aqueous Mixtures ◽  
Ionic Activity ◽  
Activity Product ◽  
Dilute Aqueous Solutions ◽  
Mean Ionic Activity Coefficients

The solubilities of potassium perrhenate in aqueous NaCl, KCl and KI solutions are reported. The solubility activity product for this electrolyte was determined using extrapolation functions involving three different mean ionic activity coefficient expressions. Mean ionic activity coefficients have been computed for potassium perrhenate in dilute aqueous solutions and there is no justification for considering ion association1,2 in these solutions.

Solubility and activity coefficients of lead chloride in potassium nitrate solutions at 25 °C and at boiling. Calculation of the supersaturation

1993 ◽  
Vol 71 (8) ◽  
pp. 1259-1264 ◽  
Author(s):  
Joan Torrent-Burgués ◽  
Sabino Veintemillas-Verdaguer
Keyword(s):  
Activity Coefficients ◽  
Potassium Nitrate ◽  
Lead Chloride ◽  
Interaction Parameters ◽  
Pitzer Equations ◽  
Ionic Interaction ◽  
Activity Product ◽  
Nitrate Solutions

The solubility and activity coefficients of lead chloride in aqueous potassium nitrate solutions, at 25 °C and at boiling, are reported. The activity product constant of lead chloride at boiling has been determined. The Pitzer equations have been applied to the system and have allowed us to determine unknown ionic interaction parameters at 25 °C. The calculation of the lead chloride supersaturation is illustrated using the activities instead of the concentrations.

Degrees of Dissociation and Hydration Numbers of Twenty Six Strong Electrolytes in Aqueous Solutions at 25 °C

1992 ◽  
Vol 57 (11) ◽  
pp. 2209-2214 ◽  
Author(s):  
Rajalakshmi Heyrovská
Keyword(s):  
Activity Coefficient ◽  
Aqueous Solutions ◽  
Osmotic Coefficients ◽  
Hydration Numbers ◽  
Ionic Activity ◽  
Strong Electrolytes ◽  
The Mean ◽  
First Time ◽  
Degrees Of Dissociation

This paper brings further results on the degrees of dissociation (α) and hydration numbers (nh) of strong electrolytes in aqueous solutions at 25 °C, evaluated for the first time from osmotic coefficients (ϕ). Presented here are also the equations for the non-ideality parameters, ϕ and γ± (the mean molal ionic activity coefficient), in terms of α and nh.

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 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.

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.

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