Hypochlorous acid

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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.

Quantity Value Units Method Reference Comment
Δfgas-17.80kcal/molReviewChase, 1998Data last reviewed in March, 1979
Quantity Value Units Method Reference Comment
gas,1 bar56.525cal/mol*KReviewChase, 1998Data last reviewed in March, 1979

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

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Temperature (K) 298. to 1400.1400. to 6000.
A 7.30007912.90250
B 8.0520200.347048
C -5.006662-0.059193
D 1.2958810.008396
E -0.034246-2.012631
F -20.40790-25.40280
G 62.9767067.70270
H -17.80000-17.80000
ReferenceChase, 1998Chase, 1998
Comment Data last reviewed in March, 1979 Data last reviewed in March, 1979

Reaction 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.

Data compiled by: John E. Bartmess

Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. A general reaction search form is also available. Future versions of this site may rely on reaction search pages in place of the enumerated reaction displays seen below.

Individual Reactions

ClO- + Hydrogen cation = Hypochlorous acid

By formula: ClO- + H+ = HClO

Quantity Value Units Method Reference Comment
Δr355.6 ± 1.1kcal/molD-EADistelrath and Boesl, 2000gas phase
Quantity Value Units Method Reference Comment
Δr349.1 ± 1.2kcal/molH-TSDistelrath and Boesl, 2000gas phase

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 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

IE (eV) Method Reference Comment
11.12 ± 0.01PEColbourne, Frost, et al., 1978LLK
11.7 ± 0.2EIFisher, 1967RDSH

De-protonation reactions

ClO- + Hydrogen cation = Hypochlorous acid

By formula: ClO- + H+ = HClO

Quantity Value Units Method Reference Comment
Δr355.6 ± 1.1kcal/molD-EADistelrath and Boesl, 2000gas phase; B
Quantity Value Units Method Reference Comment
Δr349.1 ± 1.2kcal/molH-TSDistelrath and Boesl, 2000gas phase; B

References

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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]

Distelrath and Boesl, 2000
Distelrath, V.; Boesl, U., Mass selective gas phase study of ClO, OClO, ClOO and ClAr by anion-ZEKE-photoelectron spectroscopy, Faraday Disc. Chem. Soc., 2000, 115, 161-174, https://doi.org/10.1039/a909618c . [all data]

Colbourne, Frost, et al., 1978
Colbourne, D.; Frost, D.C.; McDowell, C.A.; Westwood, N.P.C., The photoelectron spectra of the isoelectronic molecules hypochlorous acid HOCl chloramine NH2Cl, J. Chem. Phys., 1978, 68, 3574. [all data]

Fisher, 1967
Fisher, I.P., Mass spectrometry study of intermediates in thermal decomposition of perchloric acid and chlorine dioxide, J. Chem. Soc. Faraday Trans., 1967, 63, 684. [all data]


Notes

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