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

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IV Selected auxiliary data
• for CODATA values from [1989COX/WAG], the ± terms have the meaning:
“it is probable, but not at all certain, that the true values of the thermodynamic
quantities differ from the recommended values given in this report by no
more than twice the ± terms attached to the recommended values”.
• for values from [1992GRE/FUG], [1999RAR/RAN], [2003GUI/FAN],
[2005GAM/BUG] and [2005OLI/NOL], the ± terms are derived from total
uncertainties in the corresponding equilibrium constant of reaction (cf. Table
IV-2), and from the ± terms listed for the necessary CODATA key values.
CODATA [1989COX/WAG] values are available for CO 2 (g), HCO − 3
, CO 2−
3
,
HPO − 2 4
and HPO 2−
4
. From the values given for Δ
fH ο
m
and S ο m
the values of ΔfG ο
m
and,
consequently, all the relevant equilibrium constants and enthalpy changes can be calculated.
The propagation of errors during this procedure, however, leads to uncertainties in
the resulting equilibrium constants that are significantly higher than those obtained from
experimental determination of the constants. Therefore, reaction data for CO 2 (g),
HCO − 3
, CO 2− 3
, which were absent form the corresponding Table IV-2 in
[1992GRE/FUG], are included in this volume to provide the user of selected data for the
organic ligands (cf. Chapter III) with the data needed to obtain the lowest possible uncertainties
on reaction properties.
Note that the values in Table IV-1 and Table IV-2 may contain more digits
than those listed in either [1989COX/WAG] or in the chapters devoted to data selection in
[1992GRE/FUG], [1995SIL/BID], [2001LEM/FUG], [2003GUI/FAN], [2005GAM/BUG]
and [2005OLI/NOL], because the data in the present chapter are retrieved directly from
the computerised data base and rounded to three digits after the decimal point throughout.
CHEMICAL THERMODYNAMICS OF TIN, ISBN 978-92-64-99206-1, © OECD 2012