fluorosulphuric acid
- Formula: FHO3S
- Molecular weight: 100.070
- IUPAC Standard InChI: InChI=1S/FHO3S/c1-5(2,3)4/h(H,2,3,4)
- IUPAC Standard InChIKey: UQSQSQZYBQSBJZ-UHFFFAOYSA-N
- CAS Registry Number: 7789-21-1
- Chemical structure:
This structure is also available as a 2d Mol file or as a computed 3d SD file
The 3d structure may be viewed using Java or Javascript. - Other names: Fluorosulfonic acid
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Gas phase thermochemistry data
Go To: Top, Gas phase ion energetics data, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°gas | -753.12 | kJ/mol | Review | Chase, 1998 | Data last reviewed in June, 1972 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 297.26 | J/mol*K | Review | Chase, 1998 | Data last reviewed in June, 1972 |
Gas Phase Heat Capacity (Shomate Equation)
Cp° = A + B*t + C*t2 + D*t3 +
E/t2
H° − H°298.15= A*t + B*t2/2 +
C*t3/3 + D*t4/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 −
E/(2*t2) + G
Cp = heat capacity (J/mol*K)
H° = standard enthalpy (kJ/mol)
S° = standard entropy (J/mol*K)
t = temperature (K) / 1000.
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| Temperature (K) | 298. to 1100. | 1100. to 6000. |
|---|---|---|
| A | 39.47412 | 121.6824 |
| B | 182.3350 | 5.915214 |
| C | -152.9219 | -1.141158 |
| D | 47.85701 | 0.076383 |
| E | -0.559748 | -10.68782 |
| F | -773.6174 | -816.3737 |
| G | 293.8913 | 405.2991 |
| H | -753.1200 | -753.1200 |
| Reference | Chase, 1998 | Chase, 1998 |
| Comment | Data last reviewed in June, 1972 | Data last reviewed in June, 1972 |
Gas phase ion energetics data
Go To: Top, Gas phase thermochemistry data, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data compiled by: John E. Bartmess
De-protonation reactions
FO3S- + =
By formula: FO3S- + H+ = HFO3S
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 1285. ± 11. | kJ/mol | G+TS | Viggiano, Henchman, et al., 1992 | gas phase |
| ΔrH° | 1301.7 | kJ/mol | Acid | Larson and McMahon, 1985 | gas phase; These relative affinities are ca. 10 kcal/mol weaker than threshold values (see Wenthold and Squires, 1995) for donors greater than ca. 27 kcal/mol in free energy. This discrepancy has not yet been resolved, though the stronger value appears preferable. |
| ΔrH° | <1312. ± 8.4 | kJ/mol | EIAE | Adams, Smith, et al., 1986 | gas phase; From FSO3H (AP 0eV) |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrG° | 1255. ± 10. | kJ/mol | IMRB | Viggiano, Henchman, et al., 1992 | gas phase |
| ΔrG° | 1272.0 ± 1.3 | kJ/mol | H-TS | Larson and McMahon, 1985 | gas phase; These relative affinities are ca. 10 kcal/mol weaker than threshold values (see Wenthold and Squires, 1995) for donors greater than ca. 27 kcal/mol in free energy. This discrepancy has not yet been resolved, though the stronger value appears preferable. |
| ΔrG° | <1282. ± 13. | kJ/mol | H-TS | Adams, Smith, et al., 1986 | gas phase; From FSO3H (AP 0eV) |
References
Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Chase, 1998
Chase, M.W., Jr.,
NIST-JANAF Themochemical Tables, Fourth Edition,
J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]
Viggiano, Henchman, et al., 1992
Viggiano, A.A.; Henchman, M.J.; Dale, F.; Deakyne, C.A.; Paulson, J.F.,
Gas-Phase Reactions of Weak Bronsted Bases I-, PO3-, HSO4-, FSO3-, and CF3SO3- with Strong Bronsted Acids H2SO4, FSO3H, and CF3SO3H - A Quantitative Study,
J. Am. Chem. Soc., 1992, 114, 11, 4299, https://doi.org/10.1021/ja00037a039
. [all data]
Larson and McMahon, 1985
Larson, J.W.; McMahon, T.B.,
Fluoride and chloride affinities of the main group oxides, fluorides, oxofluorides, and alkyls. Quantitative scales of lewis acidities from ICR halide exchange equilibria,
J. Am. Chem. Soc., 1985, 107, 766. [all data]
Wenthold and Squires, 1995
Wenthold, P.G.; Squires, R.R.,
Bond dissociation energies of F2(-) and HF2(-). A gas-phase experimental and G2 theoretical study,
J. Phys. Chem., 1995, 99, 7, 2002, https://doi.org/10.1021/j100007a034
. [all data]
Adams, Smith, et al., 1986
Adams, N.G.; Smith, D.; Viggiano, A.A.; Paulson, J.F.; Henchman, M.J.,
Dissociative attachment reactions of electron with strong acid molecules,
J. Chem. Phys., 1986, 84, 6728. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, References
- Symbols used in this document:
S°gas,1 bar Entropy of gas at standard conditions (1 bar) ΔfH°gas Enthalpy of formation of gas at standard conditions ΔrG° Free energy of reaction at standard conditions ΔrH° Enthalpy of reaction at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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