Activity coefficients of potassium chloride in aqueous solutions of

potassium chloride and potassium phthalate

 

 A. Marques,* M.I.A. Ferra, M.H. Bandeira

Dep. Química, Univ. Beira-Interior, 6201-001 Covilhã, Portugal

 

 

Abstract

Mean activity coefficients of potassium chloride were determined in aqueous solutions of potassium chloride and potassium phthalate, in the temperature range 10-50 ºC and ionic strength range 0.05-4 mol kg^-1, from potentiometric measurements on a galvanic cell without liquid junction. By processing the results using the Pitzer model, interaction parameters for potassium phthalate were calculated as well as their temperature dependence.

Keywords: activity coefficients, potassium phthalate, Pitzer equations.

 

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*Corresponding author. E-mail address: ammmba@ubi.pt