Solubility product constant

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1 - Thermodynamics of the solubility of potassium nitrate in the mixed solvent, Ethanol+Water, and the related Ion-association
M. Aghaie F. Ghaemi Amiri M. Giahi

Using the evaporating method, the solubility of potassium Nitrate was determined in various mixtures containing Water and Ethanol at 25°C. The results show that the solubility of KNo3 decreases with increasing the mass percent of Ethanol in the mixtures. This trend چکیده کامل

Using the evaporating method, the solubility of potassium Nitrate was determined in various mixtures containing Water and Ethanol at 25°C. The results show that the solubility of KNo3 decreases with increasing the mass percent of Ethanol in the mixtures. This trend is along with decreasing the dielectric constant of Water+Ethanol mixtures. Moreover, it can be concluded that the totqal solubility of KNO3 may be regarded as the sum of two contributions; one referring to the free ions in the solution and the other to K+NO3-ion-pairs which are formed in the saturated solution. Estimating the formation constant, KAm for the reaction K+(soln) + NO3-(soln) AK+NO3- (ion-pair) , upon Bjerrum or fuoss models, then it is quite easy to evaluate the contributions of free ions and K+NO3-(ion-pair) to the total solubility. پرونده مقاله

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2 - Thermodynamics of Ion Association in the Saturated Solution of The Mixed Solvent (methanol+water) and Ion Pairing at 25.0°C
M. Aghaie S. Moradian

In this study, the ion association phenomenon in the saturated solution of KCl in the mixed solvent(methanol+water) was studied. The solubility of this compound in the mixed solvent (methanol+water by value percent of methanol = 60%), and in the presence of various mola چکیده کامل

In this study, the ion association phenomenon in the saturated solution of KCl in the mixed solvent(methanol+water) was studied. The solubility of this compound in the mixed solvent (methanol+water by value percent of methanol = 60%), and in the presence of various molarities of NaNO3 wasdetermined by the solvent evaporation method at 25.0°C. The results enable us to estimate the valueof thermodynamic solubility product, Ksp(th), of KCl in the mixed solvent upon the extrapolationmethod (Ksp(th) = 0.1356). Although the model solubility product, Ksp(m), was calculated upon the semitheoretical semi experimental Debey-Huckle theory shows (Ksp(m) = 0.2308 ). Comparing the valuesof Ksp(th) and Ksp(m) with the concentration solubility product, (Ksp(c) = 0.5537), we can see that thedifferences are noticeable.We assume that, part of the differences comes from non-ideality and the other part from ionassociation phenomenon. پرونده مقاله

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3 - Solubility Product Study of CdF2 in a Mixed Solvent Medium and Related Ion—Pair Formation at 25 °C
Mehran Aghaie Zahra Najafie

The solubility of CdF2 in the mixed solvent (water(1)+ethanol(2)) with mass fraction, W1 = 0.9,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 mo1.1)) of NaCI at 25&de چکیده کامل

The solubility of CdF2 in the mixed solvent (water(1)+ethanol(2)) with mass fraction, W1 = 0.9,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 mo1.1)) of NaCI at 25°C. The values ofsolubility and solubility product constant of CdF2 in the mixed solvent were evaluated at zero ionicstrength upon the extrapolation method. Then, the ion - pairing extension was calculated in theconsidered solution. پرونده مقاله

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4 - Thermodynamic study of ion- association in KNO3 solution in the mixed solvent (water +methanol)
M. Aghaie A. Asr

The solubility of KNO3 in the mixed solvent (water 85%+methanol 15%) were determined by using solvent evaporating method at different temperatures (25, 30, 40, 50, 60 ;C). In addition the equilibrium constant of ion pair formation, KIP, for K+NO3 ion-pair on the basis چکیده کامل

The solubility of KNO3 in the mixed solvent (water 85%+methanol 15%) were determined by using solvent evaporating method at different temperatures (25, 30, 40, 50, 60 ;C). In addition the equilibrium constant of ion pair formation, KIP, for K+NO3 ion-pair on the basis of Fuoss contact ion pair model was calculated. Upon choosing the extended Debye-Hückel model for estimating the mean activity coefficient of ions in the saturated solution and using the itteration calculations, we estimated the ion association contribution to the solubility of considered ionic compound in the mixed solvent at various temperatures. The value of thermodynamic solubility product constant, Ksp (th), BHdiss, BSdiss and BGdiss of KNO3 in the mixed solvent (water 85%+methanol 15%) was calculated. پرونده مقاله

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5 - Ranking DMUs by using DEA/AHP
mahnaz barkhordari tayebeh Rezaeitaziani

This paper proposes a two-stage model for ranking of decision making units (DMUs) by utilizing data envelopment analysis (DEA) and the multiple criteria decision making / multiple attribute decision making (MCDM /MADM) techniques, namely, interval analyt چکیده کامل

This paper proposes a two-stage model for ranking of decision making units (DMUs) by utilizing data envelopment analysis (DEA) and the multiple criteria decision making / multiple attribute decision making (MCDM /MADM) techniques, namely, interval analytic hierarchy process (AHP). Since the efficiency score of unity is assigned to the efficient units, we determine the efficient units by standard DEA models and calculate the weights of the criteria using proposed model. In the first stage, we have evaluated and compared the decision making units pairs with themselves by using proposed DEA model, and in the second stage by exploiting the results of the DEA model in performed pair-wise comparison, we have establish pair-wise comparison matrix; and by AHP we have presented a complete ranking for DMUs. In this paper, as well as reviewing a method for ranking of decision making units by using AHP and DEA, we have discussed this method and the suggested method by a numerical example with real values that the information gather on 23 schools. پرونده مقاله

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