Activity coefficients of aqueous Hydrochloric acid solutions up to a Molality of 6.0 mol kg-1 at temperatures from (5 to 45) °C

• Autor(a) principal: Juusola, Pekka M.
• Data de Publicação: 2006
• Outros Autores: Partanen, Jaakko, Vahteristo, Kari P., Mendonça, António, Minkkinen, Pentti O.
• Tipo de documento: Relatório
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10400.6/12332
• topic: Aqueous HydrochIoric Acid

Simple three parameter activity coefficient equation originating from the DebyeHückel theory was used for the calculation of activity coefficients of aqueous hydrochloric acid at temperatures 5-45 °C up to a molality of 6 moI kg-I. N ew data from galvanic ce1ls without a liquid junction were used in the parameter estimations of this equation. These data consist of sets of measurements in the molality range 0.3-6.5 moI kg-I at temperatures 5, 15, 25, 35, and 45°C. It was observed that alI estimated parameters folIow very simple equations with respect to temperature. They are either constant or depend linearly on the temperature. The activity coefficient equation was tested with the celI potential difference data of Hamed and Ehlers (1933), ElIis (1916), Ákerlõf and Teare (1938), and Faita and Mussini (1964). It was observed that the most important data in these sets can be predicted welI by means of the activity coefficient equation. The activity coefficients obtained using the new equation were also compared to those obtained by means of the two-parameter Hückel and Pitzer equations presented by Partanen and Covington (2002) up to molality 2.0 moI kg-t, to those obtained by means of the Pitzer equations presented by Saluja et ai. (1986) and Holmes et ai. (1987), and to those obtained by means of the equation presented by Hamer and Wu (1972) for the temperature of 25°C.