ISSN:
1572-8927
Keywords:
Activity coefficients
;
aqueous solution
;
electrolytes
;
membrane electrodes
;
potassium sulfate
;
tris (ethylenediamine) cobalt(III) chloride
;
tris (ethylenediamine) cobalt(III) sulfate
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract The activity coefficients of Co(en)3Cl3 and K2SO4 were measured by means of a cell with ion-exchange liquid membranes following the method described in paper I. The results prove that this method is even more valuable with multicharged salts than with 1-1 electrolytes. The values obtained are precise and reliable down to dilution limits never before accessible, e.g., 4×10−5 mol-kg−1 in Co(en)3Cl3. High dilution levels are of particular importance when dealing with highly charged electrolytes since the trend at higher concentrations often leads to errors both in extrapolation to infinite dilution and in the absolute activity coefficients. As an application, the activity coefficients of [Co(en)3]2(SO4)3-suspected to be wrongly evaluated in past literature-were measured, and their values at low concentrations were actually lower than those quoted before.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00647413
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