Determination of water activity, osmotic coefficient, activity coefficient, solubility, excess Gibbs energy and transfer Gibbs energy of KCl-D–sucrose-water mixture at 298.15 K

Mounir, Abdelfetah; Messnaoui, Brahim; Dinane, Abderrahim; Samaouali, Abderrahim

doi:10.1016/j.jct.2019.105962

Cited by 10 publications

(19 citation statements)

References 35 publications

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“…As expected, a good agreement is observed between the calculated values in the present work and the experimental data. The values of the parameters B KX , W 1,KX , U 1,KX , and V 1,KX were taken from our previous work . The mixing parameters W KHX , U KH , and Q 1KHX were adjusted using the osmotic coefficient data of HCl–KCl–H 2 O obtained in this work.…”

Section: Resultsmentioning

confidence: 99%

“…The values of the parameters B KX , W 1,KX , U 1,KX , and V 1,KX were taken from our previous work. 8 The mixing parameters W KHX , U KH , and Q 1KHX were adjusted using the osmotic coefficient data of HCl−KCl−H 2 O obtained in this work. Table 4 lists all model parameters estimated together with the root-mean-square deviation (RSMD) σ φ and σ γ for each type of data.…”

Section: Methodsmentioning

confidence: 99%

“…Several experimental methods have been used for determination of thermodynamic properties of electrolyte systems such as the isopiestic method, − the electromotive force (emf) method, , the hygrometric method, − the transpiration method, , etc. The measurement of water activities of systems including the hydrochloric acid system by the isopiestic method is impossible, since hydrochloric acid is volatile.…”

Section: Introductionmentioning

confidence: 99%

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Use of the Hygrometric Method for Determination of Water Activity of an Aqueous Hydrochloric Acid System at 298.15 K

2020

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This paper aims to extend the application field of the hygrometric method to systems containing volatile electrolytes. In this way, the aqueous hydrochloric acid−water solution and the aqueous hydrochloric acid−potassium chloride−water system have been studied with the hygrometric method at the temperature 298.15 K. To take into account the hydrochloric acid volatility, we use a corrected ratio of droplet growth K Adjusted = 0.0105 + 0.998•K Exp (K Exp is the measured ratio of droplet growth) obtained from experimental data of the hydrochloric acid−water system. The water activities and the corresponding osmotic coefficients are deduced from measurements of relative humidities of the HCl−KCl−H 2 O system against total molality ranging from 0.3 to 7.5 mol• kg −1 and for different ionic-strength fractions y of HCl y = I HCl /(I KCl + I HCl )) of 1/3, 1/2, 2/3, 3/4, 10/11, and 15/16 at 298.15 K. The results obtained were correlated using the PSC model to predict the solute activity coefficients in a mixture for different compositions of the aqueous solution of the hydrochloric acid system. The obtained results are used to determine the solubility and excess Gibbs energy in the studied molality range.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Use of the Hygrometric Method for Determination of Water Activity of an Aqueous Hydrochloric Acid System at 298.15 K

2020

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“…Thus, given the importance of phosphate fertilizers, we are interested in this study in the influence of the presence of an electrolyte salt on the physicochemical properties of alkali metal phosphates. The aim of this study is to investigate some physicochemical properties for the mixture of KBr and KH 2 PO 4 in aqueous solutions by the hygrometric method − at the temperature of 298.15 K. Water activities were measured for various ionic-strength fractions y of KH 2 PO 4 ( y = I KBr /[ I KH2PO4 + I KBr ]) of 0, 1/4, 1/3, 1/2, 2/3, 3/4, and 1, with the total molality between 0.1 mol·kg –1 and saturation. The water activities were used to evaluate the osmotic coefficients.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Properties Data of Ternary System KBr–KH₂PO₄–H₂O at 298.15 K

et al. 2023

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The OCP Group located in Morocco in Africa is one of the biggest producers of phosphates and fertilizers in the world and delivers products to more than 165 clients on five continents. These products include ammonium and di-ammonium phosphate, sodium phosphate, and others with added micronutrients (potassium–calcium–nitrogen) that are designed to effectively feed degraded soil. OCP has launched a new strategy in Africa called “Green Africa” to transform African agriculture and make it a platform for food production. Therefore, with the aim of developing new fertilizers and increasing the yield of soils and agriculture, we are interested in this work to study the influence of electrolytes on the fertilizer phosphate KBr–KH2PO4–H2O. This system was investigated with our developed hygrometric method at 298.15 K. The thermodynamic parameters of the studied system such as the water activity and osmotic coefficient are determined by measuring the relative humidity at various total molalities from 0.2 mol·kg–1 to about saturation, and for different ionic-strength fractions y of KH2PO4 (y = I KBr/(I KH2PO4+I KBr)) of 0, 1/4, 1/3, 1/2, 2/3, 3/4, and 1. The obtained measurements are compared to four models such the Dinane (ECA), Lin et al., Robinson and Stokes (RS), and Leitzke-Stoughton (LS II) equations. The solubilities of KBr and KH2PO4 in their aqueous mixture are also measured at 298.15 K. The solid state was characterized using powder X-ray diffraction (XRD). The PSC model was used to correlate the results and to predict the solute activity coefficients, excess Gibbs energy, and solubilities of the components in the mixture.

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“…In the present work we have determined the water activity, osmotic coefficient, and saturation point of an aqueous solution of K 2 HPO 4 / d -sucrose/water mixtures, in the K 2 HPO 4 concentration range of 0.1 to 6.0 mol·kg –1 , and the d -sucrose molality varying from 0.1 to 6.0 mol·kg –1 . These data are obtained by measuring the relative humidities of the K 2 HPO 4 / d -sucrose/water mixture using the hygrometric method that we developed in our previous works. − Crystalline solids formed from supersaturated water/ d -sucrose/KDP with varying sucrose and K 2 HPO 4 concentrations can be detected using ATR-FTIR and X-ray methods. To determine the remaining thermodynamic properties of this aqueous mixture, we used the widely employed CSP model for calculating the activity coefficient and phase equilibria of electrolyte systems.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamics of K₂HPO₄/d-Sucrose/Water System at 298.15 K: Experiment and Modeling

et al. 2023

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Thermodynamic properties of K 2 HPO 4 /D-sucrose/water ternary solutions were investigated at 298.15 K. Water activity, osmotic coefficient, and electrolyte saturation points are determined by measuring relative humidities in the wide range of K 2 HPO 4 molality (ranging from 0.1 to approximately 5 mol•kg −1 ) and for various D-sucrose contents (0.1, 0.3, 0.5, 1, 2, 3, 4, 5, and 5.5 mol•kg −1 ) in the ternary K 2 HPO 4 /D-sucrose/water system. The solid state was characterized using powder X-ray diffraction (XRD) and attenuated total reflection Fourier-transform infrared (ATR-FTIR) techniques. The obtained data were then analyzed using the Pitzer-Simonson-Clegg (PSC) model to determine several thermodynamic properties. These properties encompass the stoichiometric ionic mean activity coefficient of K 2 HPO 4 , excess Gibbs energy, solubility in aqueous solutions, and the Gibbs energy of transfer of K 2 HPO 4 between water (W) and D-sucrose/water (W+S) mixtures. Furthermore, the interactions among water, D-sucrose, and K 2 HPO 4 are also examined and discussed.

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Determination of water activity, osmotic coefficient, activity coefficient, solubility, excess Gibbs energy and transfer Gibbs energy of KCl-D–sucrose-water mixture at 298.15 K

Cited by 10 publications

References 35 publications

Use of the Hygrometric Method for Determination of Water Activity of an Aqueous Hydrochloric Acid System at 298.15 K

Use of the Hygrometric Method for Determination of Water Activity of an Aqueous Hydrochloric Acid System at 298.15 K

Thermodynamic Properties Data of Ternary System KBr–KH₂PO₄–H₂O at 298.15 K

Thermodynamics of K₂HPO₄/d-Sucrose/Water System at 298.15 K: Experiment and Modeling

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Determination of water activity, osmotic coefficient, activity coefficient, solubility, excess Gibbs energy and transfer Gibbs energy of KCl-D–sucrose-water mixture at 298.15 K

Cited by 10 publications

References 35 publications

Use of the Hygrometric Method for Determination of Water Activity of an Aqueous Hydrochloric Acid System at 298.15 K

Use of the Hygrometric Method for Determination of Water Activity of an Aqueous Hydrochloric Acid System at 298.15 K

Thermodynamic Properties Data of Ternary System KBr–KH2PO4–H2O at 298.15 K

Thermodynamics of K2HPO4/d-Sucrose/Water System at 298.15 K: Experiment and Modeling

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Determination of water activity, osmotic coefficient, activity coefficient, solubility, excess Gibbs energy and transfer Gibbs energy of KCl-D–sucrose-water mixture at 298.15 K

Thermodynamic Properties Data of Ternary System KBr–KH₂PO₄–H₂O at 298.15 K

Thermodynamics of K₂HPO₄/d-Sucrose/Water System at 298.15 K: Experiment and Modeling