Selected ATcT [1, 2] enthalpy of formation based on version 1.172 of the Thermochemical Network [3]

This version of ATcT results[3] was generated by additional expansion of version 1.156 to include species relevant to a study of photodissociation of formamide[4].

Hydrogen fluoride

Formula: HF (aq)

CAS RN: 7664-39-3

ATcT ID: 7664-39-3*800

SMILES: F

InChI: InChI=1S/FH/h1H

InChIKey: KRHYYFGTRYWZRS-UHFFFAOYSA-N

Hills Formula: F1H1

2D Image:

Aliases: HF; Hydrogen fluoride; Hydrogen monofluoride; Hydrofluoric acid; Fluorhydric acid; Fluorohydric acid; Fluorohydrogen; Fluoric acid; Fluorine hydride; Fluorine monohydride

Relative Molecular Mass: 20.006343 ± 0.000070

Δ_fH°(0 K)	Δ_fH°(298.15 K)	Uncertainty	Units
	-334.67	± 0.15	kJ/mol

Top contributors to the provenance of Δ_fH° of HF (aq)

The 17 contributors listed below account for 90.4% of the provenance of Δ_fH° of HF (aq).

Please note: The list is limited to 20 most important contributors or, if less, a number sufficient to account for 90% of the provenance. The Reference acts as a further link to the relevant references and notes for the measurement. The Measured Quantity is normaly given in the original units; in cases where we have reinterpreted the original measurement, the listed value may differ from that given by the authors. The quoted uncertainty is the a priori uncertainty used as input when constructing the initial Thermochemical Network, and corresponds either to the value proposed by the original authors or to our estimate; if an additional multiplier is given in parentheses immediately after the prior uncertainty, it corresponds to the factor by which the prior uncertainty needed to be multiplied during the ATcT analysis in order to make that particular measurement consistent with the prevailing knowledge contained in the Thermochemical Network.

Contribution (%)	TN ID	Reaction	Measured Quantity	Reference
22.0	529.1	HF (aq, 5500 H2O) → HF (aq)	Δ_rH°(298.15 K) = -10.16 ± 0.10 kJ/mol	Paulechka 2020, Hefter 1984, Kleboth 1970, Baumann 1969, Hepler 1953, Ellis 1963, Broene 1947, Hamer 1970
18.6	528.1	HF (l) → HF (aq, 5500 H2O)	Δ_rH°(298.15 K) = -5.1110 ± 0.0220 kcal/mol	Johnson 1973, Paulechka 2020
11.2	537.3	HF (g) → HF (aq)	Δ_rH°(298.15 K) = -14.81 ± 0.10 kcal/mol	Vanderzee 1971, Westrum 1949, Davis 1961, Ruterjans 1969
6.8	544.2	H2O (cr,l) + F2 (g) → 2 HF (aq, 5 H2O) + 1/2 O2 (g)	Δ_rH°(298.15 K) = -356.66 ± 0.40 kJ/mol	Paulechka 2020, Johnson 1987, Vorobev 1960, Hummel 1959, Johnson 1973
6.1	536.1	HF (g) + [OH]- (aq) → F- (aq) + H2O (cr,l)	Δ_rH°(298.15 K) = -28.065 ± 0.10 (×1.354) kcal/mol	Vanderzee 1971
5.7	2149.1	NF3 (g) + 3/2 H2 (g) → 1/2 N2 (g) + 3 HF (aq)	Δ_rH°(298.15 K) = -871.8 ± 1.2 kJ/mol	Armstrong 1959
2.8	537.1	HF (g) → HF (aq)	Δ_rH°(298.15 K) = -14.82 ± 0.20 kcal/mol	Khaidukov 1936, Vanderzee 1971, Parker 1965, est unc
2.8	537.2	HF (g) → HF (aq)	Δ_rH°(298.15 K) = -14.75 ± 0.20 kcal/mol	Hood 1951, Vanderzee 1971, Parker 1965, est unc
2.5	8493.1	SiO2 (vitr) + 2 F2 (g) → SiF4 (g) + O2 (g)	Δ_rH°(298.15 K) = -170.04 ± 0.25 kcal/mol	Wise 1963, Wise 1963
2.2	486.1	1/2 H2 (g) + 1/2 F2 (g) → HF (l)	Δ_rH°(298.15 K) = -303.56 ± 0.27 (×1.354) kJ/mol	Settle 1994, Johnson 1973, note HF
1.8	543.1	H2O (cr,l) + F2 (g) → 2 HF (aq, 3 H2O) + 1/2 O2 (g)	Δ_rH°(298.15 K) = -355.46 ± 0.80 kJ/mol	Paulechka 2020, Good 1966, Gunn 1965, Johnson 1966, Domalski 1967a, Gross 1967
1.7	546.1	SiF4 (g) + 2 H2O (cr,l) → Si (cr,l) + O2 (g) + 4 HF (aq, 5 H2O)	Δ_rH°(298.15 K) = 899.77 ± 1.20 kJ/mol	Paulechka 2020, Vorobev 1960, Hummel 1959, Johnson 1987, Good 1964, Good 1964, Johnson 1973
1.5	536.2	HF (g) + [OH]- (aq) → F- (aq) + H2O (cr,l)	Δ_rH°(298.15 K) = -27.93 ± 0.20 (×1.354) kcal/mol	Vanderzee 1971
1.3	8492.1	SiO2 (cr,l) + 2 F2 (g) → SiF4 (g) + O2 (g)	Δ_rH°(298.15 K) = -168.26 ± 0.28 (×1.269) kcal/mol	Wise 1963, Wise 1963
1.1	2152.1	1/2 N2 (g) + 3/2 F2 (g) → NF3 (g)	Δ_rH°(298.15 K) = -31.44 ± 0.30 kcal/mol	Sinke 1967
1.0	545.1	SiF4 (g) + 2 H2O (cr,l) → SiO2 (cr, quartz) + 4 HF (aq, 5 H2O)	Δ_rH°(298.15 K) = -11.11 ± 0.37 kJ/mol	Paulechka 2020, Vorobev 1960, Hummel 1959, Johnson 1987, Good 1964, Good 1964, Kilday 1973, Kilday 1973, Johnson 1973
0.6	5960.1	CF4 (g) + 2 H2O (cr,l) → CO2 (g) + 4 HF (aq, 20 H2O)	Δ_rH°(298.15 K) = -41.38 ± 0.32 (×1.874) kcal/mol	Cox 1965, as quoted by Cox 1970, Domalski 1967

Top 10 species with enthalpies of formation correlated to the Δ_fH° of HF (aq)

Please note: The correlation coefficients are obtained by renormalizing the off-diagonal elements of the covariance matrix by the corresponding variances.
The correlation coefficient is a number from -1 to 1, with 1 representing perfectly correlated species, -1 representing perfectly anti-correlated species, and 0 representing perfectly uncorrelated species.

Correlation Coefficent (%)	Species Name	Formula	Δ_fH°(298.15 K)	Uncertainty	Units	Relative Molecular Mass	ATcT ID
100.0	Fluoride	F- (aq)	-334.67	± 0.15	kJ/mol	18.99895178 ± 0.00000050	16984-48-8*800
91.5	Hydrogen fluoride	HF (aq, undissoc)	-321.36	± 0.16	kJ/mol	20.006343 ± 0.000070	7664-39-3*1000
75.8	Hydrogen fluoride	HF (aq, 5500 H2O)	-324.55	± 0.13	kJ/mol	20.006343 ± 0.000070	7664-39-3*955
59.1	Hydrogen fluoride	HF (aq, 10000 H2O)	-325.42	± 0.16	kJ/mol	20.006343 ± 0.000070	7664-39-3*850
59.1	Hydrogen fluoride	HF (aq, 7500 H2O)	-324.98	± 0.16	kJ/mol	20.006343 ± 0.000070	7664-39-3*847
59.1	Hydrogen fluoride	HF (aq, 20000 H2O)	-326.65	± 0.16	kJ/mol	20.006343 ± 0.000070	7664-39-3*852
59.1	Hydrogen fluoride	HF (aq, 50000 H2O)	-328.57	± 0.16	kJ/mol	20.006343 ± 0.000070	7664-39-3*855
59.1	Hydrogen fluoride	HF (aq, 100000 H2O)	-330.12	± 0.16	kJ/mol	20.006343 ± 0.000070	7664-39-3*861
59.1	Hydrogen fluoride	HF (aq, 500000 H2O)	-333.04	± 0.16	kJ/mol	20.006343 ± 0.000070	7664-39-3*866
55.0	Hydrogen fluoride	HF (l)	-303.201	± 0.099	kJ/mol	20.006343 ± 0.000070	7664-39-3*590

Most Influential reactions involving HF (aq)

Please note: The list, which is based on a hat (projection) matrix analysis, is limited to no more than 20 largest influences.

Influence Coefficient	TN ID	Reaction	Measured Quantity	Reference
1.000	488.1	HF (aq) → H+ (aq) + F- (aq)	Δ_rH°(298.15 K) = 0.000 ± 0.000 kcal/mol	triv
0.977	489.1	HF (aq, undissoc) → HF (aq)	Δ_rH°(298.15 K) = -3.180 ± 0.015 kcal/mol	Hepler 1953
0.880	529.1	HF (aq, 5500 H2O) → HF (aq)	Δ_rH°(298.15 K) = -10.16 ± 0.10 kJ/mol	Paulechka 2020, Hefter 1984, Kleboth 1970, Baumann 1969, Hepler 1953, Ellis 1963, Broene 1947, Hamer 1970
0.248	2149.1	NF3 (g) + 3/2 H2 (g) → 1/2 N2 (g) + 3 HF (aq)	Δ_rH°(298.15 K) = -871.8 ± 1.2 kJ/mol	Armstrong 1959
0.114	537.3	HF (g) → HF (aq)	Δ_rH°(298.15 K) = -14.81 ± 0.10 kcal/mol	Vanderzee 1971, Westrum 1949, Davis 1961, Ruterjans 1969
0.028	537.2	HF (g) → HF (aq)	Δ_rH°(298.15 K) = -14.75 ± 0.20 kcal/mol	Hood 1951, Vanderzee 1971, Parker 1965, est unc
0.028	537.1	HF (g) → HF (aq)	Δ_rH°(298.15 K) = -14.82 ± 0.20 kcal/mol	Khaidukov 1936, Vanderzee 1971, Parker 1965, est unc
0.022	489.2	HF (aq, undissoc) → HF (aq)	Δ_rH°(298.15 K) = -3.210 ± 0.100 kcal/mol	Ellis 1969
0.000	662.2	FOF (g) + 4 HBr (aq) → 2 HF (aq) + H2O (cr,l) + 2 Br2 (cr,l)	Δ_rH°(298.15 K) = -124.8 ± 5.2 (×1.139) kcal/mol	Wartenberg 1930, Wartenberg 1931, Parker 1965
0.000	658.1	FOF (g) + 2 H2 (g) → 2 HF (aq) + H2O (cr,l)	Δ_rH°(298.15 K) = -222.93 ± 2.2 (×5.187) kcal/mol	Bisbee 1966, Bisbee 1965, King 1968

References

1		B. Ruscic, R. E. Pinzon, M. L. Morton, G. von Laszewski, S. Bittner, S. G. Nijsure, K. A. Amin, M. Minkoff, and A. F. Wagner, Introduction to Active Thermochemical Tables: Several "Key" Enthalpies of Formation Revisited. J. Phys. Chem. A 108, 9979-9997 (2004) [DOI: 10.1021/jp047912y]
2		B. Ruscic, R. E. Pinzon, G. von Laszewski, D. Kodeboyina, A. Burcat, D. Leahy, D. Montoya, and A. F. Wagner, Active Thermochemical Tables: Thermochemistry for the 21^st Century. J. Phys. Conf. Ser. 16, 561-570 (2005) [DOI: 10.1088/1742-6596/16/1/078]
3		B. Ruscic and D. H. Bross, Active Thermochemical Tables (ATcT) values based on ver. 1.172 of the Thermochemical Network (2024); available at ATcT.anl.gov
4		K. L. Caster, N. A. Seifert, B. Ruscic, A. W. Jasper, and K. Prozument, Dynamics of HCN, NHC, and HNCO Formation in the 193 nm Photodissociation of Formamide J. Phys. Chem. A (in press) (2024) [DOI: 10.1021/acs.jpca.4c02232]
5		B. Ruscic, Uncertainty Quantification in Thermochemistry, Benchmarking Electronic Structure Computations, and Active Thermochemical Tables. Int. J. Quantum Chem. 114, 1097-1101 (2014) [DOI: 10.1002/qua.24605]
6		B. Ruscic and D. H. Bross, Thermochemistry Computer Aided Chem. Eng. 45, 3-114 (2019) [DOI: 10.1016/B978-0-444-64087-1.00001-2]

Formula

The aggregate state is given in parentheses following the formula, such as: g - gas-phase, cr - crystal, l - liquid, etc.

Uncertainties

The listed uncertainties correspond to estimated 95% confidence limits, as customary in thermochemistry (see, for example, Ruscic [5] and Ruscic and Bross[6]).
Note that an uncertainty of ± 0.000 kJ/mol indicates that the estimated uncertainty is < ± 0.000₅ kJ/mol.

Website Functionality Credits

The reorganization of the website was developed and implemented by David H. Bross (ANL).
The find function is based on the complete Species Dictionary entries for the appropriate version of the ATcT TN.
The molecule images are rendered by Indigo-depict.
The XYZ renderings are based on Jmol: an open-source Java viewer for chemical structures in 3D. http://www.jmol.org/.

Acknowledgement

This work was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences and Biosciences under Contract No. DE-AC02-06CH11357.