Contributions to the Data on Theoretical Metallurgy: [Part] 7. The Thermodynamic Properties of Sulphur and its Inorganic Compounds Page: 91
ii, 154 p. : tables ; 24 cm.View a full description of this report.
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THERMODYNAMIC PROPERTIES OF SULPHUR 91
Heat and free energy of formation equations for PbSO4 now may be
obtained by the usual methods. The necessary specific-heat relation-
ships have been mentioned previously, except that for PbSO4 for which
Maier (93) has estimated
PbSO4: C,=18.72+20.5X10- T. (472)
Consequently, for the formation of PbSO4 from the elements,
AC= - 7.17 + 11.72 X 10-3 T+ 3.754 X 105T-2. (473)
Evaluating AHo and I from AH298.1 and AF29s.1, the following results
are obtained:
Pb + S(rh) + 202= PbSO4;
AH= -216,380- 7.17 T+ 5.86X 10-3T2-3.754X 105T-1, (474)
AFo= -216,380+ 16.51 Tlog T-5.86X 10-3T2- 1.877X 105 T- + 39.36 T, (475)
AH298.1= --219,290; AF2es.1= - 193,650; AS2s.1 = - 86.0.
BASIC LEAD SULPHATES
Several basic lead sulphates are known, and their thermodynamic
properties are obtainable from available equilibrium studies. These
substances will be considered in turn, starting with the simplest,
PbSO4. PbO.
PbSO4. PbO.--Reinders (132, 133), Schenck and Albers (139), and
Schenck and Borkenstein (140) have studied the reaction 7PbSO4+
PbS=4(PbSO4 - PbO)+4S02. In considering this reaction the spe-
cific heat of PbO is taken as (67)
PbO: C= 10.33+3.18X 10-3T, (476)
and the assumption is made that in the temperature range under
consideration, 2980 to 1,0000, the specific heat of PbO.PbSO4 does
not differ greatly from the sum of those of PbO and PbSO4. This
assumption and the specific-heat equations that have been tabulated
yield
ACp= 20.13- 47.13 X 10-3T- 8.180 X 105 T-2, (477)
which corresponds to
r= --R In K+46.36 log T-23.56X 10-3T-4.090X 105T-2= T +I, (478)
in which K-=P4so,. The resulting Z-calculations are summarized in
table 64, the headings for which are self-explanatory.
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Kelley, K. K. Contributions to the Data on Theoretical Metallurgy: [Part] 7. The Thermodynamic Properties of Sulphur and its Inorganic Compounds, report, 1937; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc66396/m1/93/: accessed April 26, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.