Chemical Thermodynamics of Tin - Volume 12 - OECD Nuclear ...

340
A Discussion of selected references
Table A-27: Value of ε(Sn 2+ , ClO − 4 ) for variable temperature.
t/°C Δε = 2ε(H + , ClO − 4
) − ε(Sn 2+ , ClO − 4
)/kg·mol –1 ε(Sn 2+ , ClO − 4
)/kg·mol –1
15 0.047 ± 0.009 0.23 ± 0.04
25 0.094 ± 0.006 0.19 ± 0.04
35 0.078 ± 0.007 0.20 ± 0.04
The reported and recalculated values of the standard electrode potendial
ο
Sn 2+ + H 2 (g) β-Sn + 2 H +
ο
E for
were used to estimate Δ fHm(Sn 2+ , 298.15 K), see Figure A-36. For the determination
ο
of a reliable value of Δ fHm(Sn 2+ , 298.15 K) more data pairs E ο , T over a wider
temperature range would be needed.
ο
Figure A-36: Determination of Δ fHm(Sn 2+ , 298.15 K). (: original experimental data
of [1973VAS/GLA], error bars as given by the authors; dashed line: linear fit of the
experimental data weighted by uncertainties; : experimental data recalculated by this
review, error bars estimated by the reviewer; solid line: linear fit of the recalculated data
weighted by uncertainties).
-0.475
-0.480
slope·2F = Δ f
H° m
Δ f
H° m
(Sn 2+ , 298.15 K)/kJ·mol –1
- (12.6 ± 1.2)
- (12.6 ± 3.3)
E°·T –1 / mV·K –1
-0.485
-0.490
-0.495
[1973VAS/GLA]
original
recalc.
3.20 3.25 3.30 3.35 3.40 3.45 3.50
1000K / T
CHEMICAL THERMODYNAMICS OF TIN, ISBN 978-92-64-99206-1, © OECD 2012