hydrogen fluoride

• Formula: FH
• Molecular weight: 20.00634
• IUPAC Standard InChI: InChI=1S/FH/h1H Copy

  
• IUPAC Standard InChIKey: KRHYYFGTRYWZRS-UHFFFAOYSA-N Copy
• CAS Registry Number: 7664-39-3
• 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.
• Isotopologues:
  • [2H]hydrogen fluoride
• Permanent link for this species. Use this link for bookmarking this species for future reference.
• Information on this page:
  • Gas phase thermochemistry data
  • Phase change data
  • Henry's Law data
  • Gas phase ion energetics data
  • Ion clustering data
  • References
  • Notes
• Other data available:
  • Reaction thermochemistry data
  • Constants of diatomic molecules
• Data at other public NIST sites:
  • Microwave spectra (on physics lab web site)
  • Gas Phase Kinetics Database
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Gas phase thermochemistry data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Gas Phase Heat Capacity (Shomate Equation)

C_p° = 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
    C_p = heat capacity (cal/mol*K)
    H° = standard enthalpy (kcal/mol)
    S° = standard entropy (cal/mol*K)
    t = temperature (K) / 1000.

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Phase change data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled as indicated in comments:
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director
AC - William E. Acree, Jr., James S. Chickos

Enthalpy of vaporization

Antoine Equation Parameters

log₁₀(P) = A − (B / (T + C))
    P = vapor pressure (atm)
    T = temperature (K)

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Henry's Law data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: Rolf Sander

Henry's Law constant (water solution)

k_H(T) = k°_H exp(d(ln(k_H))/d(1/T) ((1/T) - 1/(298.15 K)))
k°_H = Henry's law constant for solubility in water at 298.15 K (mol/(kg*bar))
d(ln(k_H))/d(1/T) = Temperature dependence constant (K)

Gas phase ion energetics data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data evaluated as indicated in comments:
HL - Edward P. Hunter and Sharon G. Lias
L - Sharon G. Lias

Data compiled as indicated in comments:
B - John E. Bartmess
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
LL - Sharon G. Lias and Joel F. Liebman

Ionization energy determinations

Appearance energy determinations

De-protonation reactions

 +  =

By formula: F^- + H⁺ = HF

Ion clustering data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled as indicated in comments:
B - John E. Bartmess
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias

Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. Searches may be limited to ion clustering reactions. A general reaction search form is also available.

Clustering reactions

 +  = ( • )

By formula: Br^- + HF = (Br^- • HF)

Bond type: Hydrogen bond (negative ion to hydride)

C₃HF₆O^- +  = (C₃HF₆O^- • )

By formula: C₃HF₆O^- + HF = (C₃HF₆O^- • HF)

Bond type: Hydrogen bond (negative ion to hydride)

C₄F₉O^- +  = (C₄F₉O^- • )

By formula: C₄F₉O^- + HF = (C₄F₉O^- • HF)

Bond type: Hydrogen bond (negative ion to hydride)

C₄H₃F₆O^- +  = (C₄H₃F₆O^- • )

By formula: C₄H₃F₆O^- + HF = (C₄H₃F₆O^- • HF)

Bond type: Hydrogen bond (negative ion to hydride)

 +  = ( • )

By formula: Cl^- + HF = (Cl^- • HF)

Bond type: Hydrogen bond (negative ion to hydride)

 +  = ( • )

By formula: F^- + HF = (F^- • HF)

Bond type: Hydrogen bond (negative ion to hydride)

Free energy of reaction

 +  = ( • )

By formula: HF⁺ + HF = (HF⁺ • HF)

H₂F⁺ +  = (H₂F⁺ • )

By formula: H₂F⁺ + HF = (H₂F⁺ • HF)

(H₂F⁺ • ) +  = (H₂F⁺ • 2)

By formula: (H₂F⁺ • HF) + HF = (H₂F⁺ • 2HF)

 +  = ( • )

By formula: I^- + HF = (I^- • HF)

Bond type: Hydrogen bond (negative ion to hydride)

References

Go To: Top, Gas phase thermochemistry data, Phase change data, Henry's Law data, Gas phase ion energetics data, Ion clustering data, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Cox, Wagman, et al., 1984
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Chase, M.W., Jr., NIST-JANAF Themochemical Tables, Fourth Edition, J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]

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Streng, A.G., Miscibility and Compatibility of Some Liquid and Solidified Gases at Low Temperature, J. Chem. Eng. Data, 1971, 16, 357. [all data]

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Campbell, Alan Newton; Campbell, Alexandra Jean Robson, The thermodynamics of binary liquid mixtures : formic acid and water, Trans. Faraday Soc., 1934, 30, 1109, https://doi.org/10.1039/tf9343001109 . [all data]

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Simons, Joseph, THE PREPARATION, FREEZING POINT AND VAPOR PRESSURE OF HYDROGEN FLUORIDE, J. Am. Chem. Soc., 1924, 46, 10, 2179-2183, https://doi.org/10.1021/ja01675a006 . [all data]

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Sheft, I.; Perkins, A.J.; Hyman, H.H., Anhydrous Hydrogen Fluoride: Vapor Pressure and Liquid Density, J. Inorg. Nucl. Chem., 1973, 35, 11, 3677-3680, https://doi.org/10.1016/0022-1902(73)80055-7 . [all data]

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Hunter, E.P.; Lias, S.G., Evaluated Gas Phase Basicities and Proton Affinities of Molecules: An Update, J. Phys. Chem. Ref. Data, 1998, 27, 3, 413-656, https://doi.org/10.1063/1.556018 . [all data]

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Bieri, G.; Schmelzer, A.; Asbrink, L.; Jonsson, M., Fluorine and the fluoroderivatives of acetylene and diacetylene studied by 30.4 nm He(II) photoelectron spectroscopy, Chem. Phys., 1980, 49, 213. [all data]

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Tiedemann, P.W.; Anderson, S.L.; Ceyer, S.T.; Hirooka, T.; Ng, C.Y.; Mahan, B.H.; Lee, Y.T., Proton affinities of hydrogen halides determined by the molecular beam photoionization method, J. Chem. Phys., 1979, 71, 605. [all data]

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Foner, S.N.; Hudson, R.L., Mass spectrometry of excited state molecules: Observation of highly vibrationally excited HF by ionization potential measurement, J. Chem. Phys., 1978, 68, 2987. [all data]

Ng, Trevor, et al., 1977
Ng, C.Y.; Trevor, D.J.; Tiedemann, P.W.; Ceyer, S.T.; Kronebusch, P.L.; Mahan, B.H.; Lee, Y.T., Photoionization of dimeric polyatomic molecules: proton affinities of H₂O and HF, J. Chem. Phys., 1977, 67, 4235. [all data]

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Farber, M.; Srivastava, R.D., Mass spectrometric determination of the heats of formation of the silane fluorides, Chem. Phys. Lett., 1977, 51, 307. [all data]

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Guyon, P.-M.; Spohr, R.; Chupka, W.A.; Berkowitz, J., Threshold photoelectron spectra of HF, DF, F₂, J. Chem. Phys., 1976, 65, 1650. [all data]

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Shaw, R.W., Jr.; Thomas, T.D., Auger electron spectrum and ionization potentials of the HF molecule, Phys. Rev. A:, 1975, 11, 1491. [all data]

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Debies, T.P.; Rabalais, J.W., Calculated photoionization cross-sections and angular distributions for the isoelectronic series Ne, HF, H₂O, NH₃, and CH₄, J. Am. Chem. Soc., 1975, 97, 487. [all data]

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Walker, T.E.H.; Dehmer, P.M.; Berkowitz, J., Rotational band shapes in photoelectron spectroscopy: HF DF, J. Chem. Phys., 1973, 59, 4292. [all data]

Berkowitz, 1971
Berkowitz, J., Experimental potential energy curves for X²{PI} and ²Σ⁺ states of HF⁺, Chem. Phys. Lett., 1971, 11, 21. [all data]

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Berkowitz, J.; Chupka, W.A.; Guyon, P.M.; Holloway, J.H.; Spohr, R., Photoionization mass spectrometric study of F₂, HF, and DF, J. Chem. Phys., 1971, 54, 5165. [all data]

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Notes

Go To: Top, Gas phase thermochemistry data, Phase change data, Henry's Law data, Gas phase ion energetics data, Ion clustering data, References

• Symbols used in this document:
  

  AE	Appearance energy
  IE (evaluated)	Recommended ionization energy
  S°gas,1 bar	Entropy of gas at standard conditions (1 bar)
  T	Temperature
  Tboil	Boiling point
  Tfus	Fusion (melting) point
  d(ln(kH))/d(1/T)	Temperature dependence parameter for Henry's Law constant
  k°H	Henry's Law constant at 298.15K
  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
  ΔrS°	Entropy of reaction at standard conditions
  ΔvapH	Enthalpy of vaporization

• Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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