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

X.1 Nitrogen compounds and complexes 233
log
Figure X-2 shows the result of the SIT extrapolation to I = 0 of the values of
ο
β listed in Table X-1. The selected value from the weighted linear regression is
10 2
ο
log10 β
2
((X.1), q = 2, 298.15 K) = (1.39 ± 0.53).
Figure X-1: Extrapolation to I = 0 of the experimental data for reaction Sn 2+ −
+ NO3
in NaClO 4 media.
3
SnNO + 0 2 4 6 8
3
Sn 2+ + NO – 3 SnNO+ 3
2
log 10
β 1
+ 4D
1
0
I / mol·kg –1
The corresponding ion interaction coefficient is Δε((X.1), q = 2) =
(0.01 ± 0.09) kg·mol –1 . Using this value, ε(Sn(NO 3 ) 2 (aq), NaClO 4 (aq)) =
(0.130 ± 0.011) kg·mol –1 can be derived.
The selected thermodynamic formation constants correspond to
and hence
ο
m
Δ rG ((X.1), q = 1, 298.15 K) = − (7.25 ± 1.77) kJ·mol –1 ,
ο
m
ο
m
Δ rG ((X.1), q = 2, 298.15 K) = − (7.9 ± 3.0) kJ·mol –1 ,
f
ο
m
Δ G ( SnNO + , 298.15 K) = − (145.4 ± 1.8) kJ·mol –1 ,
3
Δ fG (Sn(NO 3 ) 2 (aq), 298.15 K) = − (256.9 ± 3.2) kJ·mol –1 .
CHEMICAL THERMODYNAMICS OF TIN, ISBN 978-92-64-99206-1, © OECD 2012