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Nitrous acid


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
Deltafgas-18.34kcal/molReviewChase, 1998Data last reviewed in June, 1963
Quantity Value Units Method Reference Comment
gas,1 bar59.610cal/mol*KReviewChase, 1998Data last reviewed in June, 1963

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. - 1200.1200. - 6000.298. - 2000.2000. - 6000.
A 5.95118117.603109.03207518.90629
B 21.839301.16037012.960850.398523
C -15.49860-0.220222-6.513241-0.062965
D 4.2830000.0145411.2191660.003561
E -0.032203-2.177771-0.121963-3.596559
F -21.06500-28.53480-22.46453-31.16109
G 60.7713074.1740066.2275374.41635
H -18.34010-18.34010-18.84001-18.84001
ReferenceChase, 1998Chase, 1998Chase, 1998Chase, 1998
Comment Data last reviewed in June, 1963 Data last reviewed in June, 1963 Data last reviewed in June, 1963 Data last reviewed in June, 1963

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 as indicated in comments:
B - John E. Bartmess
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein

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

Nitrogen oxide anion + Hydrogen cation = Nitrous acid

By formula: NO2- + H+ = HNO2

Quantity Value Units Method Reference Comment
Deltar340.23 ± 0.21kcal/molD-EAErvin, Ho, et al., 1988gas phase; B
Quantity Value Units Method Reference Comment
Deltar333.73 ± 0.31kcal/molH-TSErvin, Ho, et al., 1988gas phase; B

Nitrogen oxide anion + Nitrous acid = (Nitrogen oxide anion bullet Nitrous acid)

By formula: NO2- + HNO2 = (NO2- bullet HNO2)

Quantity Value Units Method Reference Comment
Deltar32.5 ± 1.0kcal/molTDAsLee, Keesee, et al., 1980gas phase; B

Benzenamine, N-ethyl- + Nitrous acid = Benzenamine, N-ethyl-N-nitroso- + Water

By formula: C8H11N + HNO2 = C8H10N2O + H2O

Quantity Value Units Method Reference Comment
Deltar-18.84kcal/molCmSwientoslawski, 1910liquid phase; ALS

Diphenylamine + Nitrous acid = Water + N-Nitrosodiphenylamine

By formula: C12H11N + HNO2 = H2O + C12H10N2O

Quantity Value Units Method Reference Comment
Deltar-15.02kcal/molCmSwientoslawski, 1910solid phase; ALS

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)

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

H (mol/kg*bar) d(ln(kH))/d(1/T) (K) Method Reference
50.4900.MBecker, Kleffmann, et al., 1996
49.4900.MN/A
49.4800.TN/A
48.4700.TN/A
37. CN/A
49.4800.LN/A

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
LL - Sharon G. Lias and Joel F. Liebman

Ionization energy determinations

IE (eV) Method Reference Comment
<=11.3DERLias, Bartmess, et al., 1988LL

De-protonation reactions

Nitrogen oxide anion + Hydrogen cation = Nitrous acid

By formula: NO2- + H+ = HNO2

Quantity Value Units Method Reference Comment
Deltar340.23 ± 0.21kcal/molD-EAErvin, Ho, et al., 1988gas phase; B
Quantity Value Units Method Reference Comment
Deltar333.73 ± 0.31kcal/molH-TSErvin, Ho, et al., 1988gas phase; B

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 by: John E. Bartmess

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

Nitrogen oxide anion + Nitrous acid = (Nitrogen oxide anion bullet Nitrous acid)

By formula: NO2- + HNO2 = (NO2- bullet HNO2)

Quantity Value Units Method Reference Comment
Deltar32.5 ± 1.0kcal/molTDAsLee, Keesee, et al., 1980gas phase

References

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Henry's Law data, Gas phase ion energetics data, Ion clustering data, NIST Free Links, Notes

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]

Ervin, Ho, et al., 1988
Ervin, K.M.; Ho, J.; Lineberger, W.C., Ultraviolet Photoelectron Spectrum of NO2-, J. Phys. Chem., 1988, 92, 19, 5405, https://doi.org/10.1021/j100330a017 . [all data]

Lee, Keesee, et al., 1980
Lee, N.; Keesee, R.G.; Castleman, A.W., Jr., The properties of clusters in the gas phase. IV. Complexes of H2O and HNOx clustering on NOx-, J. Chem. Phys., 1980, 72, 1089. [all data]

Swientoslawski, 1910
Swientoslawski, W., Thermochemische Untersuchungen der organischen Verbindungen. Dritte Mitteilung. Stickstoffhaltige Verbindungen., Z. Phys. Chem., 1910, 72, 49-83. [all data]

Becker, Kleffmann, et al., 1996
Becker, K.H.; Kleffmann, J.; Kurtenbach, R.; Wiesen, P., Solubility of Nitrous Acid (HONO) in Sulfuric Acid Solutions, J. Phys. Chem., 1996, 100, 14984-14990. [all data]

Lias, Bartmess, et al., 1988
Lias, S.G.; Bartmess, J.E.; Liebman, J.F.; Holmes, J.L.; Levin, R.D.; Mallard, W.G., Gas-phase ion and neutral thermochemistry, J. Phys. Chem. Ref. Data, Suppl. 1, 1988, 17, 1-861. [all data]


Notes

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Henry's Law data, Gas phase ion energetics data, Ion clustering data, NIST Free Links, References