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Mehran Aghaie - One of the best experts on this subject based on the ideXlab platform.

  • Thermodynamic Study of the Solubility Product Constant of K2Cr2O7 in Aqueous Solution and Related Ion-Pair Formation at 25 °C
    Journal of Chemical & Engineering Data, 2013
    Co-Authors: Mehran Aghaie, Zahra Shahamat
    Abstract:

    The Solubility of K2Cr2O7 in water at 25 °C was determined by using the evaporating method in the presence of various concentrations (0, 0.0500, 0.100, ..., 1.800 mol·L–1) of NaNO3. The values of Solubility and Solubility Product Constant was evaluated at zero ionic strength upon the extrapolation method. Using the value of Solubility Product Constant obtained by the extrapolation method enables us to calculate the extension of ion-pairing in the saturated solution of K2Cr2O7 at 25 °C. On the other hand, the ion-association phenomenon could be explained by the Bjerrum theory or contact ion-pair model of Fuoss theory.

  • Solubility Product Study of CdF2 in a Mixed Solvent Medium and Related Ion-Pair Formation at 25 °C
    Journal of Physical & Theoretical Chemistry, 2012
    Co-Authors: Mehran Aghaie, Zahra Najafie
    Abstract:

    The Solubility of CdF2 in the mixed solvent (water(1)+ethanol(2)) with mass fraction, 9 . 0 w 1 = , was determined by using solvent evaporating method in the presence of various concentrations (0.100, 0.200, 0.300, 0.400, 0.500, 0.600, 0.800 and 1.500 mol.L -1 ) of NaCl at 25 o C. The values of Solubility and Solubility Product Constant of CdF2 in the mixed solvent were evaluated at zero ionic strength upon the extrapolation method. Then, the ion - pairing extension was calculated in the considered solution.

  • Solubility Product of K2SO4 in a Mixed Solvent Medium and Ion-Pair Formation at 25 °C†
    Journal of Chemical & Engineering Data, 2010
    Co-Authors: Mehran Aghaie, Saideh Ghafourian
    Abstract:

    The Solubility of K2SO4 in the mixed solvent, (water (1) + ethanol (2)) with mass fraction w1 = 0.9, was determined by using the evaporating method in the presence of various concentrations, (0, 0.100, 0.150, 0.200, 0.300, 0.400, 0.500, 0.600, 0.700, and 0.800) mol·L−1, of NaNO3 at 25 °C. The values of Solubility and Solubility Product Constant were evaluated at zero ionic strength for ions in the saturated solution (at a molarity of NaNO3 = 0 mol·L−1) by using the Van Rysselberghe and Eisenberg model, and the ion-pairing extension was calculated in the considered solution by an extrapolating method that uses the experimental results and estimates the mean activity coefficient at 25 °C.

  • Non-ideality and ion-pairing in saturated aqueous solution of sodium fluoride at 25 °C
    Journal of Molecular Liquids, 2006
    Co-Authors: Mehran Aghaie, E. Samaie
    Abstract:

    Abstract Using Solvent Evaporating and Atomic Emission Spectrophotometric methods, the Solubility of NaF in water at 25 °C was determined. Comparing the value of the thermodynamic Solubility Product Constant, Ksp(th), (Ksp(th) = exp(− ΔGdiss° / RT)) of NaF to the value which is obtained from the observed Solubility, s/mol L−1, and activity coefficients, f+ and f−, which are estimated upon the extended Debye–Huckel law, Ksp′ = [Na+][F−]f+f−, revealed a great difference. The difference has satisfactorily been explained using a combination of Debye–Huckel law and Ion-Association Theory.

Mason B. Tomson - One of the best experts on this subject based on the ideXlab platform.

  • the temperature and ionic strength dependence of the Solubility Product Constant of ferrous phosphonate
    Langmuir, 1998
    Co-Authors: Stephen J Friedfeld, Shiliang He, Mason B. Tomson
    Abstract:

    A new compound with implications in scale and corrosion control has been isolated and its Solubility measured under varying conditions of temperature and ionic strength from 25 to 75 °C and from 1 to 3 M ionic strength. Ferrous phosphonate was formed using the phosphonate nitrilotris(methylene phosphonic acid) (NTMP) and was found to have the stoichiometry Fe2.5HNTMP. Using a complexation and speciation model, the stability Constants for the complexation of iron(II) with phosphonate were calculated, and the Solubility Product Constant was derived for each temperature and ionic strength; at 25 °C and 1 M ionic strength, Ksp = 10-31.2. The temperature (T, K) and ionic strength (I, M) dependence of the negative logarithm of the ferrous phosphonate Solubility Product Constant (pKsp) was determined to be:  pKsp = 39.54 − 6.14I1/2 + 2.18I − 1315/T. In simulated calculations using actual field data to compare iron and calcium phosphonates independently, ferrous salts were predicted to form in all instances and m...

  • the temperature dependence of the Solubility Product Constant of vivianite
    Geochimica et Cosmochimica Acta, 1994
    Co-Authors: Amal Alborno, Mason B. Tomson
    Abstract:

    Abstract Vivianite Fe3(PO4)2 · 8H2O is an important phosphate mineral in many natural and environmental aquatic systems. Yet, the Solubility Product Constant of vivianite has been determined only at room temperature. A new apparatus has been designed to facilitate the study of redox sensitive elements. Using this apparatus the Solubility Product Constant of vivianite has been determined from 5 to 90°C. The equilibrium aqueous model MINTEQA2 used for data interpretation assumes the formation of all possible aqueous complexes. The temperature dependence of the negative logarithm of vivianite Solubility (pKsp) Product can be described between 5 to 90°C by pKsp = −234.205 + 12,242.6/T + 92.510 log10T, where T is temperature in Kelvin, yielding log Ksp = −35.767 ± 0.076 at 25°C. Using this expression, the calculated values of ΔG°, ΔH°, ΔS°, and ΔC°p at 25°C and 0.969 atm total pressure are 204.1 kJ mol−1, 5.05 kJ mol−1, −667.8 J K−1 mol−1, and −769 J K−1 mol−1, respectively.

Maria Boltoeva - One of the best experts on this subject based on the ideXlab platform.

  • Effect of aqueous hydrochloric acid and zwitterionic betaine on the mutual Solubility between a protic betainium-based ionic liquid and water
    Journal of Molecular Liquids, 2019
    Co-Authors: Merinda F. Volia, E. E. Tereshatov, Valérie Mazan, Charles M. Folden, Maria Boltoeva
    Abstract:

    Abstract The Solubility of hydrophobic betainium bis(trifluoromethylsulfonyl)imide ionic liquid in an aqueous phase with controlled acidity has been investigated by a standard liquid–liquid extraction technique. The effect of zwitterionic betaine added into the aqueous phase has also been studied. Quantitative NMR was employed to characterize the distribution behavior of the ionic liquid constituents between the two phases. A mathematical model to describe the ionic liquid Solubility in the aqueous phase was developed. This approach was utilized to estimate the conditional Solubility Product Constant of the ionic liquid. The possibility of the transfer of some dissociation Products back into the organic phase was investigated.

  • Effect of aqueous hydrochloric acid and zwitterionic betaine on the mutual Solubility between a protic betainium-based ionic liquid and water
    Journal of Molecular Liquids, 2019
    Co-Authors: Merinda F. Volia, E. E. Tereshatov, Valérie Mazan, Charles M. Folden, Maria Boltoeva
    Abstract:

    The Solubility of hydrophobic betainium bis(trifluoromethylsulfonyl)imide ionic liquid in an aqueous phase with controlled acidity has been investigated by a standard liquid-liquid extraction technique. The effect of zwitterionic betaine added into the aqueous phase has also been studied. Quantitative NMR was employed to characterize the distribution behavior of the ionic liquid constituents between the two phases. A mathematical model to describe the ionic liquid Solubility in the aqueous phase was developed. This approach was utilized to estimate the conditional Solubility Product Constant of the ionic liquid. The possibility of the transfer of some dissociation Products back into the organic phase was investigated. (C) 2018 Elsevier B.V. All rights reserved.

Zahra Shahamat - One of the best experts on this subject based on the ideXlab platform.

  • Thermodynamic Study of the Solubility Product Constant of K2Cr2O7 in Aqueous Solution and Related Ion-Pair Formation at 25 °C
    Journal of Chemical & Engineering Data, 2013
    Co-Authors: Mehran Aghaie, Zahra Shahamat
    Abstract:

    The Solubility of K2Cr2O7 in water at 25 °C was determined by using the evaporating method in the presence of various concentrations (0, 0.0500, 0.100, ..., 1.800 mol·L–1) of NaNO3. The values of Solubility and Solubility Product Constant was evaluated at zero ionic strength upon the extrapolation method. Using the value of Solubility Product Constant obtained by the extrapolation method enables us to calculate the extension of ion-pairing in the saturated solution of K2Cr2O7 at 25 °C. On the other hand, the ion-association phenomenon could be explained by the Bjerrum theory or contact ion-pair model of Fuoss theory.

Merinda F. Volia - One of the best experts on this subject based on the ideXlab platform.

  • Effect of aqueous hydrochloric acid and zwitterionic betaine on the mutual Solubility between a protic betainium-based ionic liquid and water
    Journal of Molecular Liquids, 2019
    Co-Authors: Merinda F. Volia, E. E. Tereshatov, Valérie Mazan, Charles M. Folden, Maria Boltoeva
    Abstract:

    Abstract The Solubility of hydrophobic betainium bis(trifluoromethylsulfonyl)imide ionic liquid in an aqueous phase with controlled acidity has been investigated by a standard liquid–liquid extraction technique. The effect of zwitterionic betaine added into the aqueous phase has also been studied. Quantitative NMR was employed to characterize the distribution behavior of the ionic liquid constituents between the two phases. A mathematical model to describe the ionic liquid Solubility in the aqueous phase was developed. This approach was utilized to estimate the conditional Solubility Product Constant of the ionic liquid. The possibility of the transfer of some dissociation Products back into the organic phase was investigated.

  • Effect of aqueous hydrochloric acid and zwitterionic betaine on the mutual Solubility between a protic betainium-based ionic liquid and water
    Journal of Molecular Liquids, 2019
    Co-Authors: Merinda F. Volia, E. E. Tereshatov, Valérie Mazan, Charles M. Folden, Maria Boltoeva
    Abstract:

    The Solubility of hydrophobic betainium bis(trifluoromethylsulfonyl)imide ionic liquid in an aqueous phase with controlled acidity has been investigated by a standard liquid-liquid extraction technique. The effect of zwitterionic betaine added into the aqueous phase has also been studied. Quantitative NMR was employed to characterize the distribution behavior of the ionic liquid constituents between the two phases. A mathematical model to describe the ionic liquid Solubility in the aqueous phase was developed. This approach was utilized to estimate the conditional Solubility Product Constant of the ionic liquid. The possibility of the transfer of some dissociation Products back into the organic phase was investigated. (C) 2018 Elsevier B.V. All rights reserved.