Citation
F. Malatesta et al., Activity and osmotic coefficients from the emf of liquid membrane cells. VIII. K-3[Co(CN)(6)], Mg-3[Co(CN)(6)](2), and Ca-3[Co(CN)(6)](2), J SOL CHEM, 29(5), 2000, pp. 449-461
Citations number
26
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
JOURNAL OF SOLUTION CHEMISTRY
ISSN journal
00959782
→ ACNP
Volume
29
Issue
5
Year of publication
2000
Pages
449 - 461
Database
ISI
SICI code
0095-9782(200005)29:5<449:AAOCFT>2.0.ZU;2-D
Abstract
The activity coefficients of K-3[Co(CN)(6)], Mg-3[Co(CN)(6)](2), and Ca-3[C
o(CN)(6)](2), are examined. The results highlight close similarity with the
corresponding hexacyanoferrate (III) salts. On dilution, K-3[Co(CN)(6)], l
ike K-3[Fe(CN)(6)], approaches the limiting law from the upper side, while
Mg-3[Co(CN)(6)](2) and Ca-3[Co(CN)(6)](2) tend to the limiting law from the
opposite side, like Mg-3[Fe(CN)(6)](2), Ca-3[Fe(CN)(6)](2), Sr-3[Fe(CN)(6)
](2), and Ba-3[Fe(CN)(6)](2). Both kinds of behavior agree with theory for
a model of hard spheres bearing electric charges +1 and -3 or +2 and -3, re
spectively. The parameter values of the Pitzer equation for activity and os
motic coefficients are reported.