Standard enthalpies of formation of cesium fluoroxysulfate (CsSO/sub 4/F) and cesium peroxydisulfate (Cs/sub 2/S/sub 2/O/sub 8/)

Journal Article · Thu Jan 01 00:00:00 EST 1981 · Inorg. Chem.; (United States)

DOI:https://doi.org/10.1021/ic50218a014· OSTI ID:6226796

Steele, W V; O'Hare, P A.G.; Appelman, E H

The enthalpies of reaction of cesium fluoroxysulfate, CsSO/sub 4/F, and cesium perocydisulfate, Cs/sub 2/S/sub 2/O/sub 8/, with HI(aq) have been measured by solution calorimetry, and the following standard enthalpies of formation at 298.15 K have been derived: ..delta..H/sub f//sup 0/(CsSO/sub 4/F(c)) = -1004.9 +- 1.6 kJ mol/sup -1/ and ..delta..H/sub f//sup 0/(Cs/sub 2/S/sub 2/O/sub 8/(c)) = -1936.7 +- 2.8 lJ mol/sup -1/. The enthalpy of solution of Cs/sub 2/S/sub 2/O/sub 8/(c) in 5345 mol of water at 298.15 K has been determined to be 79.5 +- 1.9 kJ mol/sup -1/. The Gibbs energy of solution of CsSO/sub 4/F at 298.15 K has been determined from solubility measurements to be ..delta..G/sub soln//sup 0/ (CsSO/sub 4/F) = 6.15 +- 0.40 kJ mol/sup -1/. The fluoroxysulfate results have been used in conjunction with an estimated entropy for solid CsSO/sub 4/F to calculate a standard potential of 2.52 +- 0.05 V at 298.15 K for the half-reaction SO/sub 4/F/sup -/(aq) + 2H/sup +/(aq) + 2e/sup -/ ..-->.. HSO/sup 4 -/(aq) + HF(aq). 8 tables.

• Research Organization: Argonne National Lab., IL
• OSTI ID: 6226796
• Journal Information: Inorg. Chem.; (United States), Vol. 20:4
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CESIUM COMPOUNDS
FORMATION HEAT
SOLUTION HEAT
CESIUM FLUORIDES
FREE ENERGY
CESIUM SULFATES
OXYGEN COMPOUNDS
SULFUR COMPOUNDS
CALORIMETRY
ENTROPY
EXPERIMENTAL DATA
ALKALI METAL COMPOUNDS
DATA
ENERGY
ENTHALPY
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
INFORMATION
NUMERICAL DATA
PHYSICAL PROPERTIES
REACTION HEAT
SULFATES
THERMODYNAMIC PROPERTIES
400201* - Chemical & Physicochemical Properties