ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Electrical conductivity of molten calcium nitrate and calcium chloride hydrates

J. Novák, I. Sláma, and Z. Kodejš

Institute of Inorganic Chemistry, Czechoslovak Academy of Sciences, 250 6S Řež near Prague

Abstract: The temp. and Ca²⁺ concn. dependence of the equiv. cond. Λ was studied in the system CaCl₂-Ca(NO₃)₂-H₂O at ionic fraction y_Cl- = [Cl^-]/([Cl^-] + [NO₃^-]) ≃ 0.2. The temp. dependence is described either by the Arrhenius, Vogel, Vogel-Tammann-Fulcher equations, or the 2nd degree polynomial in the form ln Λ = A + BT + CT². It is shown that the Arrhenius equation is unsuitable to describe the Λ = f(T) dependence in the temp. interval studied (293-353 K). The other equations describe behavior of the system with the sufficient accuracy. The concn. dependence of the cond. satisfies the relation ln Λ = a + bx_Ca + cx_Ca² + dx_Ca³ (x_Ca denotes mole fraction of Ca) in the interval of x_Ca from 0.05 to 0.20. The comparison is being made also between the presently studied system and the system with y_Cl- ≃ 0.1.

Full paper in Portable Document Format: 311a29.pdf

Chemical Papers 31 (1) 29–37 (1977)