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Advisor(s)
Abstract(s)
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.
Description
Keywords
Aqueous HydrochIoric Acid
Citation
Publisher
Lappeenrannan teknilliennen yliopisto