A Conductivity Study of Unsymmetrical 2:1 Type “Complex Ion” Electrolyte: Cadmium Chloride in Dilute Aqueous Solutions

• Published in: The journal of physical chemistry. B Vol. 117; no. 17; pp. 5241 - 5248
• Main Authors: Apelblat, Alexander, Esteso, Miguel A, Bešter-Rogač, Marija
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 02-05-2013
• Subjects: Aqueous solutions; Cadmium chlorides; Chemistry; Constraining; Electrical resistivity; Electrochemistry; Electrolytes; Exact sciences and technology; General and physical chemistry; Mathematical analysis; Mathematical models; Properties of electrolytes: conductivity; Resistivity; Electrical conductivity; Aqueous solution; Electrolyte; Cadmium chloride; Concentration effect
• ISSN: 1520-6106; 1520-5207
• DOI: 10.1021/jp4024074

Systematic and precise measurements of electrical conductivities of aqueous solutions of cadmium chloride were performed in the 2 × 10–5 - 1 × 10–2 mol·dm–3 concentration range, from 278.15 to 313.15 K. Determined conductances were interpreted in terms of molecular model which includes a mixture of two 1:1 and 2:1 electrolytes. The molar limiting conductances of λ0(CdCl+, T) and λ0(1/2Cd2+, T), the equilibrium constants of CdCl+ formation K(T) and the corresponding standard thermodynamic functions were evaluated using the Quint-Viallard conductivity equations, the Debye–Hückel equations for activity coefficients and the mass-action equation. An excellent agreement between calculated and experimental conductivities was reached.