Activity coefficients of electrolytes from the emf of liquid membrane cells. III: LaCl[sub 3], K[sub 3]Fe(CN)[sub 6], and LaFe(CN)[sub 6]
- Universita di Pisa (Italy)
The activity coefficients of LaCl[sub 3], K[sub 3]Fe(CN)[sub 6], and LaFe(CN)[sub 6] were measured down to about 1 [times] 10[sup [minus]4], 3 [times] 10[sup [minus]5], and 2 [times] 10[sup [minus]5] mol-kg[sup [minus]1] respectively, by means of cells with ion-exchange liquid membranes. In the diluted region, the trend of lanthanum chloride agrees with the Debye-Huckel theory and corroborates earlier findings in the literature relevant to more concentrated solutions, with minor systematic corrections of the [gamma][sub +=] values. F[sub 3]Fe(CN)[sup 6] attains (rather than tends to attain) the Debye-Huckel limiting slope at [approx] 1 [times] 10[sup [minus]3] mol-kg[sup [minus]1], and lanthanum ferricyanide in the diluted region shows negative deviations from the limiting law, similar to the ones predicted for large-sized, highly-charged ions in the diluted region by Bjerrum's IPBE, and Mayer's theories. The behavior of LaCl[sub 3] in the concentrated solutions proves that lanthanum ion drags along with it into the membrane many molecules of water which were then found to be twelve. Pitzer's theory best-fit coefficients that meet the experimental curves to be reproduced satisfactorily are reported. 17 refs., 4 figs., 3 tabs.
- OSTI ID:
- 7283753
- Journal Information:
- Journal of Solution Chemistry; (United States), Vol. 23:1; ISSN 0095-9782
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ELECTROCHEMICAL CELLS
ELECTROMOTIVE FORCE
FERRICYANIDES
THERMODYNAMIC ACTIVITY
LANTHANUM CHLORIDES
POTASSIUM COMPOUNDS
AQUEOUS SOLUTIONS
ELECTROLYTES
EXPERIMENTAL DATA
ION EXCHANGE MATERIALS
REACTION KINETICS
ALKALI METAL COMPOUNDS
CHLORIDES
CHLORINE COMPOUNDS
COMPLEXES
DATA
DISPERSIONS
HALIDES
HALOGEN COMPOUNDS
INFORMATION
IRON COMPLEXES
KINETICS
LANTHANUM COMPOUNDS
MATERIALS
MIXTURES
NUMERICAL DATA
RARE EARTH COMPOUNDS
SOLUTIONS
TRANSITION ELEMENT COMPLEXES
400400* - Electrochemistry