Hydrogen peroxide

• Formula: H₂O₂
• Molecular weight: 34.0147
• IUPAC Standard InChI: InChI=1S/H2O2/c1-2/h1-2H Copy

  
• IUPAC Standard InChIKey: MHAJPDPJQMAIIY-UHFFFAOYSA-N Copy
• CAS Registry Number: 7722-84-1
• Chemical structure:
  This structure is also available as a 2d Mol file
• Permanent link for this species. Use this link for bookmarking this species for future reference.
• Information on this page:
  • Phase change data
  • Gas phase ion energetics data
  • References
  • Notes
• Other data available:
  • Gas phase thermochemistry data
  • Reaction thermochemistry data
  • Henry's Law data
  • Ion clustering data
  • IR Spectrum
  • Vibrational and/or electronic energy levels
• Data at other public NIST sites:
  • Gas Phase Kinetics Database
• Options:
  • Switch to SI units

Data at NIST subscription sites:

• NIST / TRC Web Thermo Tables, professional edition (thermophysical and thermochemical data)

NIST subscription sites provide data under the NIST Standard Reference Data Program, but require an annual fee to access. The purpose of the fee is to recover costs associated with the development of data collections included in such sites. Your institution may already be a subscriber. Follow the links above to find out more about the data in these sites and their terms of usage.

Phase change 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.

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

Gas phase ion energetics data

Go To: Top, Phase change data, References, Notes

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

Ionization energy determinations

Appearance energy determinations

De-protonation reactions

HO₂^- +  =

By formula: HO₂^- + H⁺ = H₂O₂

References

Go To: Top, Phase change 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.

Cuthbertson, Matheson, et al., 1928
Cuthbertson, A.C.; Matheson, G.L.; Maass, O., The Freezing Point and Density of Pure Hydrogen Peroxide, J. Am. Chem. Soc., 1928, 50, 1120. [all data]

Nikitin, Pavlov, et al., 1995
Nikitin, E.D.; Pavlov, P.A.; Popov, A.P.; Nikitina, H.E., Critical properties of hydrogen peroxide determined from direct measurements, J. Chem. Thermodyn., 1995, 27, 945-52. [all data]

Maass and Hiebert, 1924
Maass, O.; Hiebert, P.G., THE PROPERTIES OF PURE HYDROGEN PEROXIDE. V. VAPOR PRESSURE, J. Am. Chem. Soc., 1924, 46, 12, 2693-2700, https://doi.org/10.1021/ja01677a012 . [all data]

Hunter and Lias, 1998
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]

Ashmore and Burgess, 1977
Ashmore, F.S.; Burgess, A.R., Study of Some Medium Size Alcohols and Hydroperoxides by Photoelectron Spectroscopy, J. Chem. Soc. Faraday Trans. 2, 1977, 73, 1247. [all data]

Brown, 1975
Brown, R.S., A photoelectron investigation of the peroxide bond, Can. J. Chem., 1975, 53, 3439. [all data]

Foner and Hudson, 1962
Foner, S.N.; Hudson, R.L., Ionization and dissociation of hydrogen peroxide by electron impact, J. Chem. Phys., 1962, 36, 2676. [all data]

Lindeman and Guffy, 1958
Lindeman, L.P.; Guffy, J.C., Determination of the O-O bond energy in hydrogen peroxide by electron impact, J. Chem. Phys., 1958, 29, 247. [all data]

Osafune and Kimura, 1974
Osafune, K.; Kimura, K., Photoelectron spectroscopic study of hydrogen peroxide, Chem. Phys. Lett., 1974, 25, 47. [all data]

Foner and Hudson, 1962, 2
Foner, S.N.; Hudson, R.L., Mass spectrometry of the HO₂ free radical, J. Chem. Phys., 1962, 36, 2681. [all data]

Ramond, Blanksby, et al., 2002
Ramond, T.M.; Blanksby, S.J.; Kato, S.; Bierbaum, V.M.; Davico, G.E.; Schwartz, R.L.; Lineberger, W.C.; Elliso, Heat of formation of the hydroperoxyl radical HOO via negative ion studies, J. Phys. Chem. A, 2002, 106, 42, 9641-9647, https://doi.org/10.1021/jp014614h . [all data]

Bierbaum, Schmidt, et al., 1981
Bierbaum, V.M.; Schmidt, R.J.; DePuy, C.H.; Mead, R.H.; Schulz, P.A.; Lineberger, W.C., Reactions of carbanions with triplet and singlet molecular oxygen, J. Am. Chem. Soc., 1981, 103, 6262. [all data]

Notes

Go To: Top, Phase change data, Gas phase ion energetics data, References

• Symbols used in this document:
  

  AE	Appearance energy
  IE (evaluated)	Recommended ionization energy
  Pc	Critical pressure
  Tc	Critical temperature
  Tfus	Fusion (melting) point
  ΔrG°	Free energy of reaction at standard conditions
  ΔrH°	Enthalpy of reaction at standard conditions
  ΔvapH	Enthalpy of vaporization

• Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
• The National Institute of Standards and Technology (NIST) uses its best efforts to deliver a high quality copy of the Database and to verify that the data contained therein have been selected on the basis of sound scientific judgment. However, NIST makes no warranties to that effect, and NIST shall not be liable for any damage that may result from errors or omissions in the Database.
• Customer support for NIST Standard Reference Data products.