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

A Discussion of selected references
371
2
species ( SnSCN − q
2− q
, q = 1, 2, 3) and three ternary complexes ( SnCl SCN x− y
x y
, (x, y) =
(1,1), (1,2) and (2,1)). The Vasil'ev equation has been applied to calculate the
thermodynamic formation constants. All measurements were made in ternary tin(II)-
chloride-thiocyanate systems, thus separate measurements to determine the formation
constants of the binary thiocyanato complexes were not performed. The graphical
presentation of the experimental data are provided only for I = 1 M. Based on this
information, the NaClO 4 medium was entirely replaced by NaSCN and NaCl during the
measurements. The re-evaluation of the experimental data is not possible, and an
important medium effect can be expected in the region where the bis- and triscomplexes
are formed. Therefore an uncertainty of ± 0.5 has been assigned to the
log10 β
1
values of the SnSCN + binary complex, while the formation constants of the
species Sn(SCN) 2 (aq), SnSCN −
3
and the ternary complexes were not considered any
further in this review.
Table A-44: Measured heat capacity data for SnBr 2 (cr) from [1980BER/STE].
ο
C p,m
T/K
T/K
T/K
T/K
(SnBr 2 , cr, T )/
(SnBr 2 , cr, T )/
(SnBr 2 , cr, T )/
(SnBr 2 , cr, T )/
–1
J·mol
–1·K
–1
J·mol
–1·K
–1
J·mol
–1·K
–1
J·mol
–1·K
5.49 0.6077 32.50 29.94 101.40 66.02 207.26 75.48
6.35 0.9315 33.54 31.12 109.12 67.38 212.00 75.67
7.25 1.343 36.73 34.54 112.95 67.90 216.71 75.97
8.22 1.884 37.82 35.65 117.07 68.48 221.37 76.18
10.38 3.419 42.78 40.25 125.25 69.57 235.96 76.71
11.30 4.233 46.47 43.29 129.87 70.13 241.50 76.88
12.24 5.174 47.99 44.49 134.90 70.71 247.00 77.07
13.20 6.249 52.05 47.48 139.83 71.16 252.44 77.28
14.14 7.454 53.98 48.85 144.66 71.57 257.83 77.49
15.08 8.582 55.82 50.00 154.16 72.31 263.19 77.71
16.04 9.6?4 61.12 53.02 158.82 72.69 268.50 77.92
17.04 10.89 64.24 54.62 163.40 72.98 273.77 78.12
18.14 12.26 67.33 56.24 167.93 73.28 279.69 78.32
19.12 13.49 71.53 57.76 172.40 73.46 286.83 78.70
20.00 14.62 75.02 59.11 176.82 73.86 293.44 78.62
20.92 15.79 82.75 61.61 177.29 73.89 299.03 79.10
21.86 16.97 85.96 62.47 181.72 74.16 304.66 79.22
24.64 20.51 89.05 63.45 186.12 74.41 310.28 79.39
25.65 21.79 92.04 64.04 192.23 74.70 315.86 79.61
28.41 25.15 94.96 64.72 197.37 75.00 321.79 79.89
29.38 26.31 97.95 65.36 202.46 75.26
ο
C p,m
ο
C p,m
ο
C p,m
CHEMICAL THERMODYNAMICS OF TIN, ISBN 978-92-64-99206-1, © OECD 2012