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

VIII.3 Aqueous halide complexes
175
and Δε((VIII.10), q = 1) = − (0.15 ± 0.05) kg·mol –1 . Using the latter value,
ε(Sn 2+ , ClO − 4
) and ε(Na + , Cl – ), the ion interaction coefficient ε(SnCl + , ClO − 4
) =
(0.08 ± 0.07) kg·mol –1 is calculated.
Figure VIII-19: Extrapolation to I = 0 of the experimental data for reaction Sn 2+ +
Cl – SnCl + in NaClO 4 media. Experimental data from: [1928PRY],
[1950DUK/COU], [1951DUK/PIN], [1952VAN/RHO], [1961TOB/HUG],
[1975FED/BOL] and [2001MUL/SEW].
3.5
Sn 2+ + Cl – SnCl +
3.0
log 10
β 1
+ 4D
2.5
2.0
1.5
1.0
0 1 2 3 4 5 6 7 8 9
I / mol·kg –1
A similar treatment (Figure VIII-20 and Figure VIII-21) of the accepted data
for the Reactions ((VIII.10), q = 2 and 3) resulted in the selected values:
and
ο
log10 β
2
((VIII.10), q = 2, 298.15 K) = (2.17 ± 0.17)
ο
log10 β
3
((VIII.10), q = 3, 298.15 K) = (2.13 ± 0.19).
The slope of the straight lines in Figure VIII-20 and Figure VIII-21 correspond
to Δε((VIII.10), q = 2) = − (0.26 ± 0.05) kg·mol –1 and Δε((VIII.10), q = 3) =
− (0.25 ± 0.05) kg·mol –1 , respectively. From these values ε(SnCl 2 (aq), NaClO 4 (aq)) =
(0.00 ± 0.007) kg·mol –1 and ε(Na + , SnCl − 3
) = (0.04 ± 0.07) kg·mol –1 can be derived.
CHEMICAL THERMODYNAMICS OF TIN, ISBN 978-92-64-99206-1, © OECD 2012