scholarly journals Mean Activity Coefficients of Peroxodisulfates in Saturated Solutions of the Conversion System 2NH4+ — 2Na+ — S2O8 2– — SO4 2– — H2O at 20 °C and 30 °C

2013 ◽  
Vol 6 (2) ◽  
pp. 163-167
Author(s):  
Jan Balej
Keyword(s):  
Activity Coefficient ◽  
Activity Coefficients ◽  
Relative Activity ◽  
Solubility Data ◽  
Correlation Equations ◽  
Conversion System ◽  
Mean Activity Coefficients ◽  
Saturated Solutions

Abstract Solubility data of the conversion system 2NH4+ - 2Na+ - S2O82- - SO42- - H2O at 20 °C and 30 °C for the partial pseudoternary systems Na2S2O8-(NH4)2SO4-H2O, (NH4)2S2O8-Na2SO4-H2O, Na2S2O8-NaNH4SO4-H2O and (NH4)2S2O8-NaNH4SO4-H2O have been correlated using the relative activity coefficient expansion of the crystallizing component. The obtained correlation equations have been used for the calculation of mean activity coefficients of ammonium and sodium peroxodisulfates in their saturated solutions of the mentioned pseudoternary systems.

Physical Interpretation of Solubility Interaction Constants from the Series Expansion of the Relative Activity Coefficients

1994 ◽  
Vol 59 (9) ◽  
pp. 1911-1921 ◽  
Author(s):  
Jaroslav Nývlt ◽  
Jitka Eysseltová
Keyword(s):  
Activity Coefficient ◽  
Series Expansion ◽  
Activity Coefficients ◽  
Physical Interpretation ◽  
Ternary Systems ◽  
Relative Activity ◽  
Solubility Data ◽  
Close Relationship ◽  
Insight Into ◽  
Saturated Solutions

Hydration analysis, which enables information on ionic processes in saturated solutions to be derived from solubility data in ternary systems, was applied to the interpretation of solubility interaction constants from the relative activity coefficient expansion. A close relationship was found between the hydration analysis parameters and the solubility interaction constants characterizing the relative activity of solute, which extends our insight into the ionic behaviour of the system studied by using the values of the interaction constants.

Solubility in the System (NH4)2S2O8—NH3—H2O and Mean Activity Coefficients of Saturated Solutions of (NH4)2S2O8

2012 ◽  
Vol 5 (1) ◽  
pp. 12-14
Author(s):  
Jan Balej
Keyword(s):  
Activity Coefficient ◽  
Activity Coefficients ◽  
Pure Water ◽  
Relative Activity ◽  
Mean Activity Coefficient ◽  
The Mean ◽  
Water Values ◽  
Mean Activity Coefficients ◽  
Ammonium Peroxodisulfate ◽  
Saturated Solutions

Solubility in the System (NH4)2S2O8—NH3—H2O and Mean Activity Coefficients of Saturated Solutions of (NH4)2S2O8The solubility data of ammonium peroxodisulfate in aqueous ammonia solutions at 15.5 °C have been evaluated using the relative activity coefficient expansion. Using the known value of the mean activity coefficient of saturated solution of ammonium peroxodisulfate in pure water, values of the mean activity coefficients of this salt in the saturated solutions of the given system have been calculated.

Hydration Analysis and the Expansion of Relative Activity Coefficients

2000 ◽  
Vol 65 (12) ◽  
pp. 1833-1838
Author(s):  
Jaroslav Nývlt
Keyword(s):  
Ternary System ◽  
Phase Equilibria ◽  
Activity Coefficients ◽  
Binary Systems ◽  
Ternary Systems ◽  
Relative Activity ◽  
Solubility Data ◽  
Thermodynamic Condition ◽  
Correlation Methods ◽  
Correlation Parameters

Of correlation methods for solubility in ternary systems, the method of expansion of relative activity coefficients and the hydration analysis are based on the thermodynamic condition of phase equilibria. Both of them require only reliable solubility data in the ternary system and corresponding binary systems. Correlation parameters of both of these methods are interrelated and the methods are compared on the system K2SO4-H2SO4-H2O at 50 °C.

Activity Coefficients of Aqueous Solutions of NaOH and KOH in Wide Concentration and Temperature Ranges

1996 ◽  
Vol 61 (11) ◽  
pp. 1549-1562 ◽  
Author(s):  
Jan Balej
Keyword(s):  
Experimental Data ◽  
Aqueous Solutions ◽  
Temperature Interval ◽  
Water Activity ◽  
Activity Coefficients ◽  
Correlation Equations ◽  
Wide Temperature Interval ◽  
Temperature Ranges ◽  
Mean Activity Coefficients

Up to now, there exist a quite wide temperature interval between 70 or 80 and 150 °C with no sufficiently reliable experimental data of mean activity coefficients for aqueous NaOH as well as KOH solutions. In order to fill this gap, it was tried to derive suitable correlation equations for this quantity in dependence on the molality (for NaOH in the range mNaOH = 2-25 mol kg-1, for KOH in the range mKOH = 2-18 mol kg-1) and temperature (in the range 0-200 °C for both kinds of solutions) on the basis of the available data of this quantity and with the use of the previously derived correlation equations for the water activity in aqueous solutions of NaOH and KOH under the same conditions. The comparison between the calculated and experimental data was discussed.

Research on Thermodynamic Properties of Bioleaching Solution in Lean Nickel-Cobalt Ore by Pitzer - Meissner Model

2015 ◽  
Vol 1092-1093 ◽  
pp. 1455-1459
Author(s):  
Chu Yue Hou ◽  
Gui Ying Zhou ◽  
Jian Kang Wen ◽  
Biao Wu
Keyword(s):  
Thermodynamic Properties ◽  
Activity Coefficient ◽  
Aqueous Solutions ◽  
Activity Coefficients ◽  
Pitzer Model ◽  
Foreign Ions ◽  
Nickel Cobalt

In this paper, we jointly use the Pitzer model and the Meissner model to study thermodynamic laws of bioleaching solution in a lean nickel-cobalt ore in the Jilin Baishan, by using the Pitzer model to calculate activity coefficients of single electrolyte aqueous solutions and the Meissner model to calculate activity coefficients of components in the bioleaching solution. Also we studied the rules of activity coefficient of NiSO4 and CoSO4 in the solution. Results show that when separating and purifying foreign ions from bioleaching solution of the lean nickel-cobalt ore, the descending sequence of their ion concentration’s effect over the solution is Mg2+, Fe3+, Fe2+, Ni2+, Co2+ and Ca2+.

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