Selected ATcT [1, 2] enthalpy of formation based on version 1.156 of the Thermochemical Network [3]

This version of ATcT results[3] was generated by additional expansion of version 1.148 to include species relevant to a recent study of the oxidation of ethylene [4] as well as new measurements that led to refining the thermochemistry of CF and SiF and their cations [5].

Hydrogen fluoride

Formula: HF (aq, undissoc)

CAS RN: 7664-39-3

ATcT ID: 7664-39-3*1000

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
	-321.36	± 0.16	kJ/mol

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

The 16 contributors listed below account for 90.1% of the provenance of Δ_fH° of HF (aq, undissoc).

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
18.4	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
15.7	489.1	HF (aq, undissoc) → HF (aq)	Δ_rH°(298.15 K) = -3.180 ± 0.015 kcal/mol	Hepler 1953
15.6	528.1	HF (l) → HF (aq, 5500 H2O)	Δ_rH°(298.15 K) = -5.1110 ± 0.0220 kcal/mol	Johnson 1973, Paulechka 2020
9.4	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
5.7	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
5.1	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
4.8	2135.1	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
2.3	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
2.3	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
2.1	8344.1	SiO2 (vitr) + 2 F2 (g) → SiF4 (g) + O2 (g)	Δ_rH°(298.15 K) = -170.04 ± 0.25 kcal/mol	Wise 1963, Wise 1963
1.8	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
1.5	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
1.5	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
1.2	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
1.1	8343.1	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
0.9	2138.1	1/2 N2 (g) + 3/2 F2 (g) → NF3 (g)	Δ_rH°(298.15 K) = -31.44 ± 0.30 kcal/mol	Sinke 1967

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

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
91.5	Hydrogen fluoride	HF (aq)	-334.67	± 0.15	kJ/mol	20.006343 ± 0.000070	7664-39-3*800
91.5	Fluoride	F- (aq)	-334.67	± 0.15	kJ/mol	18.99895178 ± 0.00000050	16984-48-8*800
69.4	Hydrogen fluoride	HF (aq, 5500 H2O)	-324.55	± 0.13	kJ/mol	20.006343 ± 0.000070	7664-39-3*955
54.1	Hydrogen fluoride	HF (aq, 50000 H2O)	-328.57	± 0.16	kJ/mol	20.006343 ± 0.000070	7664-39-3*855
54.1	Hydrogen fluoride	HF (aq, 7500 H2O)	-324.98	± 0.16	kJ/mol	20.006343 ± 0.000070	7664-39-3*847
54.1	Hydrogen fluoride	HF (aq, 20000 H2O)	-326.65	± 0.16	kJ/mol	20.006343 ± 0.000070	7664-39-3*852
54.1	Hydrogen fluoride	HF (aq, 10000 H2O)	-325.42	± 0.16	kJ/mol	20.006343 ± 0.000070	7664-39-3*850
54.1	Hydrogen fluoride	HF (aq, 500000 H2O)	-333.04	± 0.16	kJ/mol	20.006343 ± 0.000070	7664-39-3*866
54.1	Hydrogen fluoride	HF (aq, 100000 H2O)	-330.12	± 0.16	kJ/mol	20.006343 ± 0.000070	7664-39-3*861
50.4	Hydrogen fluoride	HF (l)	-303.198	± 0.099	kJ/mol	20.006343 ± 0.000070	7664-39-3*590

Most Influential reactions involving HF (aq, undissoc)

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
0.977	489.1	HF (aq, undissoc) → HF (aq)	Δ_rH°(298.15 K) = -3.180 ± 0.015 kcal/mol	Hepler 1953
0.022	489.2	HF (aq, undissoc) → HF (aq)	Δ_rH°(298.15 K) = -3.210 ± 0.100 kcal/mol	Ellis 1969
0.001	490.2	HF (g) → HF (aq, undissoc)	Δ_rG°(298.15 K) = -5.7 ± 1.0 kcal/mol	NBS TN270, NBS Tables 1989
0.001	490.1	HF (g) → HF (aq, undissoc)	Δ_rH°(298.15 K) = -11.7 ± 1.0 kcal/mol	NBS TN270, NBS Tables 1989

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. 1.156 of the Thermochemical Network (2024); available at ATcT.anl.gov
4		N. A. Seifert, B. Ruscic, R. Sivaramakrishnan, and K. Prozument, The C2H4O Isomers in the Oxidation of Ethylene J. Mol. Spectrosc. 398, 111847/1-8 (2023) [DOI: 10.1016/j.jms.2023.111847]
5		U. Jacovella, B. Ruscic, N. L. Chen, H.-L. Le, S. Boyé-Péronne, S. Hartweg, M. Roy-Chowdhury, G. A. Garcia, J.-C. Loison, and B. Gans, Refining Thermochemical Properties of CF, SiF, and Their Cations by Combining Photoelectron Spectroscopy, Quantum Chemical Calculations, and the Active Thermochemical Tables Approach Phys. Chem. Chem. Phys. 25, 30838-30847 (2023) [DOI: 10.1039/D3CP04244H]
6		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]
7		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 [6] and Ruscic and Bross[7]).
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.