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

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IX Group 16 compounds and complexes
Table IX-15: Experimental equilibrium constants for sulfato complexes of tin(II).
Method Ionic media t/°C log 10 K
Sn 2+ +
2
SO −
4
SnSO 4 (aq)
vol 1.5 M NaNO 3
→ 0 (Na 2 SO 4 )
Ise-Sn 1 M (H,Na)ClO 4
0.52 M (H,Na)ClO 4
0.21 M (H,Na)ClO 4
0.1 M (H,Na)ClO 4
0.075 M (H,Na)ClO 4
0.037 M (H,Na)ClO 4
→ 0 ((Na,H)ClO 4 )
Sn 2+ + 2 SO − Sn(SO ) 2−
2
4
4 2
20
20
25
25
25
25
25
25
25
reported
log 10 K
recalculated (a)
log 10 K
accepted (b)
1.29 ± 0.10 1.29 ± 0.25
2.2 ± 0.5
1.27 ± 0.20
1.7 ± 0.5
1.70
1.91
2.30
2.53
2.64
2.89
3.37 ± 0.12 3.43 ± 0.17 3.43 ± 0.25
vol 1.5 M NaNO 3
→ 0 (Na 2 SO 4 )
20
20
1.65 ± 0.10 1.73 ± 0.30
3.3 ± 0.5
(a) Re-evaluated value (see Appendix A).
(b) Accepted values corrected to molal scale.
Reference
[1981PET/MIL]
[1975WAD/ITO]
[1981PET/MIL]
Figure IX-5: Extrapolation to I = 0 of the experimental data for reaction Sn 2+ +
2
4
SnSO 4 (aq) in NaClO 4 media at 25 °C (: experimental data from
[1975WAD/ITO], •: experimental data from [1981PET/MIL] for Na 2 SO 4 background
at 20 °C, not included in the SIT analysis).
SO − 0.0 0.5 1.0 1.5
4.5
4.0
3.5
log 10
β 1
+ 8D
3.0
2.5
2.0
1.5
I / mol·kg –1
CHEMICAL THERMODYNAMICS OF TIN, ISBN 978-92-64-99206-1, © OECD 2012