The ternary system H2O–Fe(NO3)3–Co(NO3)2 isotherms 0 and 15°C

Goundali, Bahija El; Kaddami, Mohammed

doi:10.1016/j.fluid.2007.07.048

Cited by 6 publications

(1 citation statement)

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“…The saturation by ice is achieved, which generates a variation in the slope of the curve of solution conductivity versus concentration. At this point the freezing temperature and molality are determined (Goundali et al, 2008;Goundali et al, 2007). For example, to determine freezing depression points of the system H 2 O-A, we start with the sample M, Figure 1-B.…”

Section: Experimental Methodsmentioning

confidence: 99%

Thermodynamic Properties and Pitzer Parameter Determination for Orthophosphoric Acid From Freezing Point and Isopiestic Measurement Data

Bakher

Kaddami

2018

Braz. J. Chem. Eng.

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The freezing depression points of aqueous phosphoric acid have been determined using a method based on measurement of solution conductivity. The osmotic coefficient for freezing point lowering was calculated by the condition of solid-liquid equilibrium and by the equation proposed by Bjerrum (1918). A calculation method is presented in this study to evaluate the ion interaction parameters for the Pitzer model from freezing point and isopiestic molalities of aqueous phosphoric acid solution. The model of Chen, Bromely and the Three-Characteristic Parameter Correlation (TCPC) are also used to model this system. The isopiestic molality values from literature data are used to optimize these models. Using these parameters, we were able to estimate thermodynamic properties: osmotic coefficient, mean activity coefficient and water activity for the H 3 PO 4-H 2 O system, and contribution to a better understanding of the thermodynamic behaviour of the aqueous system containing phosphoric acid.

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Section: Experimental Methodsmentioning

confidence: 99%