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

A Discussion of selected references
283
Figure A-14: Solubility of SnO(cr) in NaOH solutions (: experimental data; solid line:
*
linear fit ( log10 K s31= − (0.840 ± 0.016), Δε = (0.190 ± 0.038) kg·mol –1 ); dashed lines:
confidence limits; dotted lines: prediction limits).
-0.75
-0.80
SnO(cr) + OH – + H 2
O Sn(OH) –
3
-0.85
log 10
{K s 3,1
/ a(H 2
O)}
-0.90
-0.95
-1.00
-1.05
0.0 0.2 0.4 0.6 0.8 1.0 1.2
m (Na + ) / mol·kg –1
[1941MOO/PAU]
Powder photographic X-ray data are used to show that the tetragonal crystals SnO and
PbO have similar structures:
D 7 4h – P4/nmm
SnO: a 0 = (3.796 ± 0.006), c 0 = (4.816 ± 0.008) Å, Z = 2
PbO: a 0 = (3.947 ± 0.006), c 0 = (4.988 ± 0.008) Å, Z = 2.
The density of SnO(tetr.) calculated from the unit cell data amounts to
ρ = (6447 ± 31) kg·m –3 .
[1942GOR/LEI]
Data on the solubility of SnO(s) in aqueous solutions of 0.0113 to 0.1125 M HClO 4 are
presented at 25 °C. The solubilities in HClO 4 and HCl (according to [1941GAR/HEI])
are identical within the experimental error up to [Sn(II)] = 0.05 M. The authors took this
as evidence for the absence of significant chloride complexing by Sn 2+ in this
concentration range.
CHEMICAL THERMODYNAMICS OF TIN, ISBN 978-92-64-99206-1, © OECD 2012