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Measurement and correlation of the activity coefficients of individual ions in aqueous electrolyte solutions of Na 2 So 4 and K 2 So 4
Author(s) -
Rodil Eva,
Vera Juan H.
Publication year - 2001
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450790511
Subject(s) - molality , activity coefficient , aqueous solution , ion , electrolyte , chemistry , sulfate , inorganic chemistry , ionic bonding , analytical chemistry (journal) , electrode , chromatography , organic chemistry
Ion selective electrodes have been used to measure the activity coefficients at 298.2 K of individual Na + ions in aqueous solutions of Na 2 SO 4 up to 3 molal, and of individual K + ions in aqueous solutions of K 2 SO 4 up to 0.69 molal. The activity coefficients of the sulfate anion were calculated using values of the mean ionic activity coefficients of the salts. Contrary to the behavior found in 1:1 electrolyte aqueous solutions, the activity coefficients of both cations have been found to be larger than the activity coefficient of the sulfate anion. A model proposed by Khoshkbarchi and Vera was used to correlate the data and model parameters are reported.