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

A Discussion of selected references
317
This precision calorimeter was tested by measuring the heat of dissolution of
KCl at 18, 25, 35, 40, 55, 70, and 85 °C [1966VAS/LOB2]. The result agreed with the
generally accepted value.
Figure A-26: Solubility of SnO(cr) in 1.050 M NaClO 4 solutions at 25 °C (:
experimental data; solid line: iterative linear regression analysis).
3
exp. data [66MES/IRA]
not used for regression
–1
/mol·kg
–1
m Sn(II)
a H
+
2
1
m Sn(I I)
/a H
+ = * K' s1
+ ( * K' s 0
+ 3·*K'
s 43
)·a H
+
*
K' s1
= 0.0323, * K' s 43
= 3.196 (4 th iteration)
from [66MES/IRA] data, TDB Sn selection
and SIT extrapolation to I = 1.0515 m (Na)ClO 4
*K' s 0
= 247.7, log 10
*
K° s 0
= 1.756 (SIT)
0
0.000 0.005 0.010 0.015
a H
+ = 10 –pH
[1966VAS/LOB2]
To test the operation of a precision calorimeter [1966VAS/LOB] the heat of dissolution
of KCl at a dilution of 1:450 was measured at 18, 25, 35, 40, 55, 70, and 85 °C. It was
demonstrated that the precision calorimeter described in [1966VAS/LOB] operates very
well.
[1967DAV/DON]
Solutions of sodium hydroxide were added to solutions of tin(II) sulfate under air-free
conditions. Pure tritin(II) dihydroxide oxide sulfate, Sn 3 (OH) 2 OSO 4 , was obtained from
solutions of pH 1.5 to 2.4. Above pH 2.4 two distinct phases were identified in the
precipitate, basic tin(II) sulfate and hydrous tin(II) oxide.
A single crystal X-ray study resulted in the following crystal data for basic
tin(II) sulfate, Sn 3 (OH) 2 OSO 4 : orthorhombic, a = (4.970 ± 0.005) Å, b =
CHEMICAL THERMODYNAMICS OF TIN, ISBN 978-92-64-99206-1, © OECD 2012