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

178
VIII Group 17 (halogen) compounds and complexes
re-evaluated to derive selected enthalpy values for the Reactions ((VIII.10), q = 1, 2).
The details of the re-evaluation are provided in Appendix A. The recalculated enthalpy
values were extrapolated to zero ionic strength using the SIT model.
The weighted linear regression of the four data points measured in perchloric
acid solutions at 25 °C (Figure VIII-22), resulted in
Δ H ((VIII.10), q = 1, 298.15 K) = (12.7 ± 2.3) kJ·mol –1
r
ο
m
and Δε L ((VIII.10), q = 1) = (1.9 ± 1.0) × 10 –3 kg·mol –1 .
Table VIII-9: Experimental enthalpy values for Reactions ((VIII.10), q = 1 to 3).
Method Medium t/ o C Δ rHm(kJ·mol –1 ) Reference
Sn 2+ + Cl – SnCl +
Reported
Accepted
Ise-Sn 3 M (H/Na)ClO 4 0 – 45 10.9 ± 1.7 9.8 ± 2.0 (a) [1952VAN/RHO]
cal 0 corr HClO 4
0 corr HClO 4
0.20 M HClO 4
0.49 M HClO 4
0.49 M HClO 4
1.02 M HClO 4
1.02 M HClO 4
1.96 M HClO 4
1.96 M HClO 4
2.93 M HClO 4
2.93 M HClO 4
3.95 M HClO 4
15
25
15
15
25
15
25
15
25
15
25
25
6.8 ± 0.8
9.2 ± 1.8
5.7 ± 1.8
5.7 ± 1.0
7.9 ± 1.1
5.8 ± 0.9
7.7 ± 0.8
5.5 ± 0.9
6.9 ± 0.8
4.9 ± 1.1
6.3 ± 0.9
8.9 ± 2.4 (a)
7.0 ± 1.3 (a)
4.9 ± 1.8 (a)
3.1 ± 2.0 (a) [1976VAS/KOK]/
[1973VAS/VAS]
spe 0 corr ((H/Na)Cl) 25 0.10
[2001MUL/SEW] (b)
50
100
150
200
0.55
1.91
3.97
6.86
Sn 2+ + 2 Cl – SnCl 2 (aq)
Ise-Sn 3 M (H/Na)ClO 4 0 – 45 13.4 ± 3.3 14.1 ± 2.0 (a) [1952VAN/RHO]
cal 1.02 M HClO 4
1.96 M HClO 4
2.93 M HClO 4
3.95 M HClO 4
25
25
25
25
13.0 ± 5.7 (a)
10.8 ± 2.7 (a)
9.1 ± 3.2 (a)
4.3 ± 3.0 (a) [1976VAS/KOK]
(Continued on next page)
CHEMICAL THERMODYNAMICS OF TIN, ISBN 978-92-64-99206-1, © OECD 2012