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

232
X Group 15 compounds and complexes
SnNO +
3
and Sn(NO 3 ) 2 (aq) is considered (see also discussion on [1980AND/SAM]). The
experimental formation constants for the Reactions (X.1) are collected in Table X-1.
The accepted formation constants were extrapolated to zero ionic strength
using the SIT. The weighted linear regression of the five data points for SnNO +
3
( Figure X-1), resulted in the selected constant
ο
log10 β
1
((X.1), q = 1, 298.15 K) = (1.27 ± 0.31).
The determined value of Δε((X.1), q = 1) is (0.02 ± 0.07) kg·mol –1 , which corresponds
to the ion interaction coefficient ε( SnNO + 3
,ClO – 4 ) = (0.17 ± 0.09) kg·mol –1 .
2−q
Table X-1: Experimental formation constants of the species Sn(NO ) .
Method Ionic media t/°C log10
Sn 2+ −
+ NO3
SnNO +
3
Ise-Sn 1.0 M NaClO 4
2.0 M NaClO 4
3.0 M NaClO 4
4.0 M NaClO 4
6.0 M NaClO 4
25
25
25
25
25
Reported Recalculated (a) Accepted (b)
0.44 ± 0.02
0.41 ± 0.02
0.14 ± 0.02
0.15 ± 0.03
0.18 ± 0.03
β
0.23 ± 0.02
q
0.42 ± 0.40
0.37 ± 0.40
0.16 ± 0.30
0.06 ± 0.40
0.01 ± 0.40
3
q
Reference
[1980AND/SAM]
8.0 M NaClO 4 25 0.43 ± 0.04
Sn 2+ + 2NO −
3
Sn(NO 3 ) 2 (aq)
Ise-Sn 2.0 M NaClO 4 25 0.45 ± 0.05
[1980AND/SAM]
3.0 M NaClO 4 25 0.05 ± 0.02 0.04 ± 0.02 – 0.09 ± 0.30
4.0 M NaClO 4 25 – 0.06 ± 0.06
– 0.24 ± 0.40
6.0 M NaClO 4 25 0.00 ± 0.08
– 0.34 ± 0.40
8.0 M NaClO 4 25 0.57 ± 0.05
Sn 2+ + 3NO −
3
Sn(NO
3) 3
Ise-Sn 3.0 M NaClO 4 25 – 0.35 ± 0.10
[1980AND/SAM]
4.0 M NaClO 4 25 – 0.58 ± 0.11
6.0 M NaClO 4 25 – 0.85 ± 0.12
8.0 M NaClO 4 25 0.46 ± 0.11
Sn 2+ + 4NO −
2
3
Sn(NO
3) 4
Ise-Sn 4.0 M NaClO 4 25 – 0.98 ± 0.20
[1980AND/SAM]
6.0 M NaClO 4 25 – 1.20 ± 0.20
8.0 M NaClO 4 25 – 0.01 ± 0.15
(a) Re-evaluated values, see Appendix A.
(b) Accepted values corrected to molal scale. The accepted values reported in Appendix A are expressed on
the molar or molal scales, depending on which units were used originally by the authors.
CHEMICAL THERMODYNAMICS OF TIN, ISBN 978-92-64-99206-1, © OECD 2012