Densities and apparent molal volumes of aqueous CaCl2 and MgCl2 solutions |
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Authors: | Christophe Monnin |
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Institution: | (1) Laboratoire de Minéralogie et de Cristallographie, 38, rue des Trente Six Ponts, 31062 Toulouse Cédex, France |
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Abstract: | The Pitzer ion interaction model has been used to evaluate literature data for the densities of aqueous CaCl2 and MgCl2 solutions between 0 and 100°C. The selected data can be adequately fitted by setting (1),v equal to zero. The variations of (0),v and C
v
with temperature have been found to be linearly correlated. The uncertainty in the calculated density is lower than 50 ppm below 1M but raises to 300 ppm at high concentrations. When plotted vs. the square root of the molality, the apparent molal volume of MgCl2 shows a change at a concentration where a transition in the speed of sound has already been reported by Millero, et al. |
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Keywords: | Pitzer model density apparent molal volume aqueous calciam chloride aqueous magnesium chloride |
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