2
0
2009
hu
ric
0
journal
Original
Hu, B.[Baichuan]
Richey, R. D.[Randi D.]
Baird, J. K.
J. Chem. Eng. Data
2009
2020-09-29
Chemical Equilibrium and Critical Phenomena: Solubility of Indium Oxide in Isobutyric Acid + Water Near the Consolute Point
We have determined the solubility, s, of indium oxide in the liquid mixture isobutyric acid + water along the critical isopleth at temperatures above the upper critical solution temperature near 299 K. When plotted in van t Hoff form with ln s vs 1/T, the measurements of solubility lie on a straight line for values of the absolute temperature, T, which are sufficiently in excess of the critical solution temperature, Tc. The sign of the slope, (? ln s/?(1/T)), indicates that the enthalpy of dissolution is endothermic. When the temperature is within 1 K of Tc, however, the slope departs from its constant value and appears to diverge toward negative infinity. The principle of critical point universality predicts that a divergence in (? ln s/?(1/T)) is to be expected for T near Tc in those cases where the stoichiometry of the dissolution reaction involves both components of the solvent; moreover, the Gibbs-Helmholtz equation predicts that if the enthalpy of solution is endothermic, the sign of the divergence should be negative. Both of these predictions are confirmed by the experimental data.
10.1021/je8008599
5
54
1537-1540
1
InChI=1S/2In.3O/q2*+3;3*-2
PJXISJQVUVHSOJ-UHFFFAOYSA-N
diindium trioxide
indium oxide (In2O3)
indium sesquioxide
indium trioxide
indium(3+) oxide
indium(III) oxide
mesatron
In2O3
1
Commercial source
2
InChI=1S/C4H8O2/c1-3(2)4(5)6/h3H,1-2H3,(H,5,6)
KQNPFQTWMSNSAP-UHFFFAOYSA-N
2-methylpropanoic acid
.alpha.-methylpropionic acid
2-methylpropionic acid
acetic acid, dimethyl-
isobutyric acid
propanoic acid, 2-methyl-
C4H8O2
1
Commercial source
3
InChI=1S/H2O/h1H2
XLYOFNOQVPJJNP-UHFFFAOYSA-N
water
H2O
1
Commercial source
1
Fractional distillation
2
99.9
3
Estimated by the compiler
1
2
1
1
1
3
1
Principal objective of the work
AES
TRC
7/21/2009
1
Mass ratio of solute to solvent
spectrometer
1
Liquid
Direct value, X
2
3
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
Crystal
1
1
Solvent: Mass fraction
2
Liquid
0.388
3
2
Pressure, kPa
Liquid
101
3
1
Temperature, K
Liquid
1
299.1
5
1
7.26e-09
3
1
4.4e-10
1
299.35
5
1
6.56e-09
3
1
3.9e-10
1
299.55
5
1
7.53e-09
3
1
4.8e-10
1
299.75
5
1
1.125e-08
4
1
7.1e-10
1
299.95
5
1
1.38e-08
4
1
8.7e-10
1
300.2
5
1
1.988e-08
4
1
1.21e-09
1
300.77
5
1
2.702e-08
4
1
1.63e-09
1
301.69
5
1
3.291e-08
4
1
1.98e-09
1
303.47
5
1
4.218e-08
4
1
2.53e-09
1
305.22
5
1
5.707e-08
4
1
3.43e-09
1
308.8
5
1
7.31e-08
4
1
4.39e-09
1
312.4
5
1
9.78e-08
4
1
5.87e-09
1
315.96
5
1
1.267e-07
5
1
7.6e-09