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

A Discussion of selected references
337
ο
to arrive at Δ fHm
(SnI 4 , cr, 298.15 K) = − (208.78 ± 1.7) kJ·mol –1 . Their calculated
–1
entropy of 291.63 J·K
–1·mol is not based on the latest heat capacity data
[1974ANI/STE] and is therefore significantly different from the one adopted in this
review. They adopted the data for SnI 2 (cr) from [1968WAG/EVA].
Figure A-32: Solubility of SnO 2 in NaOH solutions.
-3.0
log 10
([Sn(IV)] tot
/mol·kg –1 )
-3.5
-4.0
-4.5
-5.0
-5.5
0.0 0.1 0.2 0.3 0.4 0.5 0.6
[OH – ]/mol·kg –1
[1973MUR/TRO]
The thermal decomposition of SnO by heating within 1 h to 450 °C and keeping 90 min
at 450 °C gave Sn 2 O 3 an instable intermediate phase which disproportionated to Sn and
SnO 2 on further heating. Sn 2 O 3 had lattice constants a = 5.457, b = 8.179, and c =
3.714 Å, ρ(exptl.) = 5.90 g·cm −3 , and ρ (calcd.) = 5.73 g·cm −3 .
[1973VAS/GLA]
The standard potential for the following reaction
Sn 2+ + H 2 (g) β-Sn +2 H +
was determined in aqueous perchloric acid solutions using cells (1) and (2)
Pt, H 2 | HClO 4 HClO 4 , Sn(ClO 4 ) 2 | Sn, Hg(sat) (1)
β-Sn | HClO 4 , Sn(ClO 4 ) 2 | Sn, Hg(sat) (2)
(A.51)
CHEMICAL THERMODYNAMICS OF TIN, ISBN 978-92-64-99206-1, © OECD 2012