Thermodynamic Study of Na2Cr2O7(aq) at 25 °C

Christov, Christomir; Velikova, Snejana; Ivanova, Kalina; Tanev, Stefan

doi:10.1135/cccc19990595

CCCC > Archive > 1999, Volume 64 > Issue 4 > p. 595

Thermodynamic Study of Na₂Cr₂O₇(aq) at 25 °C

Christomir Christov^a,*, Snejana Velikova^b, Kalina Ivanova^b and Stefan Tanev^b

^a Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
^b Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 8000 Bourgas, Bulgaria

Abstract

The isopiestic method was used to determine osmotic coefficients of binary Na₂Cr₂O₇(aq) solutions of concentrations 0.6777-3.8792 mol kg^-1 at 25 °C. The concentration of a saturated binary solution Na₂Cr₂O₇(aq) at 25 °C was determined. The Pitzer ion-interaction model has been used for thermodynamic analysis of the results obtained. Optimum values of the binary parameters of interionic interaction have been calculated and important thermodynamic characteristics of Na₂Cr₂O₇·2 H₂O determined.

Keywords: Sodium dichromate; Isopiestic method; Solubility; Pitzer model.

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