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Advisor(s)
Abstract(s)
Sodium benzoate is a salt widely used in industry as preserver. Its activity coefficients in
aqueous solutions can be estimated by Pitzer theory, once the necessary parameters are known.
Electromotive force (emf) measurements on galvanic cells without liquid junction have been used
for the determination o f mean activity coefficients of sodium chloride in the ternary system sodium
chloride + sodium benzoate (NaB) + water. Pitzer theory has been applied to this system and those
data enabled the evaluation of the specific parameters for sodium benzoate at 298.15 K by linear
regression. The values obtained f o r / B(0) NaB and B(1) NaB parameters, respectively 0.177 kg mol-1 and 0.34 kg mol-1 are close to those published already for other carboxylic acid salts.
Description
Keywords
Sodium benzoate Activity coefficients Pitzer theory Potentiometry
Citation
Publisher
Sociedade Portuguesa de Electroquímica