Computer Science
Scientific paper
Jan 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996gecoa..60..185b&link_type=abstract
Geochimica et Cosmochimica Acta, Volume 60, Issue 2, p. 185-195.
Computer Science
16
Scientific paper
The solubility of jarosite (KFe3(SO4)2(OH)6) was studied in a series of dissolution experiments. The experiments were conducted at 4 35 °C and at pH values between 1.5 and 3.0 using a synthetic jarosite with a composition very close to ideal. The solids were left in the reaction vessel for up to 6 months. Equilibrium was established in the experiments after approximately 3 to 4 months. The log KSP for the jarosite dissolution reaction KFe3(SO4)2(OH)6 + 6H+K+ + 3Fe3+ + 2SO42- + 6H2O at 25 °C is determined to be -11.0 ± 0.3. From this measured solubility product, the free energy of formation, ΔGf.298o is calculated to be -3309.8 ± 1.7 kJ mol-1. Based on the temperature dependence of the solubility product, the enthalpy of reaction at 25 °C, ΔHr.298o is -45 ± 5 kJ mol-1, the entropy of reaction, ΔSr.298o, is -350 ± 40 J mol-1K-1, and the heat capacity of the reaction, ΔCp.r, over the temperature range of the experiments is determined to be -2.1 ± 0.2 kJ mol-1 K-1. The rate of the dissolution reaction can be described by a first-order model.
Baron Dirk
Palmer Carl D.
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