Nitrous acid
- Formula: HNO2
- Molecular weight: 47.0134
- IUPAC Standard InChI: InChI=1S/HNO2/c2-1-3/h(H,2,3)
- IUPAC Standard InChIKey: IOVCWXUNBOPUCH-UHFFFAOYSA-N
- CAS Registry Number: 7782-77-6
- Chemical structure:
This structure is also available as a 2d Mol file or as a computed 3d SD file
View 3d structure (requires JavaScript / HTML 5) - Other names: HNO2; Kyselina dusite; Nitrosyl hydroxide; Nitrous acid, trans; HONO
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Henry's Law 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 by: Rolf Sander
Henry's Law constant (water solution)
kH(T) = k°H exp(d(ln(kH))/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(kH))/d(1/T) = Temperature dependence constant (K)
| k°H (mol/(kg*bar)) | d(ln(kH))/d(1/T) (K) | Method | Reference |
|---|---|---|---|
| 50. | 4900. | M | Becker, Kleffmann, et al., 1996 |
| 49. | 4900. | M | N/A |
| 49. | 4800. | T | N/A |
| 48. | 4700. | T | N/A |
| 37. | C | N/A | |
| 49. | 4800. | L | N/A |
Gas phase ion energetics data
Go To: Top, Henry's Law 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:
B - John E. Bartmess
LL - Sharon G. Lias and Joel F. Liebman
Ionization energy determinations
| IE (eV) | Method | Reference | Comment |
|---|---|---|---|
| ≤11.3 | DER | Lias, Bartmess, et al., 1988 | LL |
De-protonation reactions
+
=
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 340.23 ± 0.21 | kcal/mol | D-EA | Ervin, Ho, et al., 1988 | gas phase; B |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrG° | 333.73 ± 0.31 | kcal/mol | H-TS | Ervin, Ho, et al., 1988 | gas phase; B |
References
Go To: Top, Henry's Law 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.
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]
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]
Notes
Go To: Top, Henry's Law data, Gas phase ion energetics data, References
- Symbols used in this document:
d(ln(kH))/d(1/T) Temperature dependence parameter for Henry's Law constant k°H Henry's Law constant at 298.15K ΔrG° Free energy of reaction at standard conditions ΔrH° Enthalpy of reaction at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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