Nitric acid

Formula: HNO₃
Molecular weight: 63.0128
IUPAC Standard InChI: InChI=1S/HNO3/c2-1(3)4/h(H,2,3,4)
IUPAC Standard InChIKey: GRYLNZFGIOXLOG-UHFFFAOYSA-N
CAS Registry Number: 7697-37-2
Chemical structure:
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Phase change data

Go To: Top, Reaction thermochemistry data, Henry's Law data, References, Notes

Data compiled by: William E. Acree, Jr., James S. Chickos

Enthalpy of vaporization

Δ_vapH (kJ/mol)	Temperature (K)	Reference	Comment
38.6	312.	Holeci, 1966	Based on data from 273. to 356. K.

Reaction thermochemistry data

Go To: Top, Phase change data, Henry's Law data, References, Notes

Data compiled as indicated in comments:
B - John E. Bartmess
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein

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Individual Reactions

( • Nitric acid ) + = ( • 2)

By formula: (NO₃^- • HNO₃) + HNO₃ = (NO₃^- • 2HNO₃)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	76.6 ± 4.2	kJ/mol	TDAs	Davidson, Fehsenfeld, et al., 1977	gas phase; B,M
Δ_rH°	66.9 ± 3.3	kJ/mol	TDAs	Wlodek, Luczynski, et al., 1980	gas phase; B,M
Δ_rH°	77.0	kJ/mol	ATM	Arnold, Viggiano, et al., 1982	gas phase; Entropy change calculated or estimated; M
Δ_rH°	74.1	kJ/mol	HPMS	Lee, Keesee, et al., 1980	gas phase; M
Δ_rH°	83.7	kJ/mol	ATM	Arnold and Qiu, 1984	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	100.	J/mol*K	N/A	Arnold, Viggiano, et al., 1982	gas phase; Entropy change calculated or estimated; M
Δ_rS°	92.5	J/mol*K	FA	Davidson, Fehsenfeld, et al., 1977	gas phase; M
Δ_rS°	100.	J/mol*K	N/A	Arnold and Qiu, 1984	gas phase; Entropy change calculated or estimated; M
Δ_rS°	96.7	J/mol*K	HPMS	Wlodek, Luczynski, et al., 1980	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	49.0 ± 9.2	kJ/mol	TDAs	Davidson, Fehsenfeld, et al., 1977	gas phase; B,M
Δ_rG°	37.7 ± 1.3	kJ/mol	TDAs	Wlodek, Luczynski, et al., 1980	gas phase; B

Free energy of reaction

Δ_rG° (kJ/mol)	T (K)	Method	Reference	Comment
52.7	233.	ATM	Arnold, Viggiano, et al., 1982	gas phase; Entropy change calculated or estimated; M
57.7	250.	ATM	Arnold and Qiu, 1984	gas phase; Entropy change calculated or estimated; M

( • 2 Nitric acid ) + = ( • 3)

By formula: (NO₃^- • 2HNO₃) + HNO₃ = (NO₃^- • 3HNO₃)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	67.4 ± 4.2	kJ/mol	TDAs	Davidson, Fehsenfeld, et al., 1977	gas phase; B,M
Δ_rH°	58.2 ± 5.9	kJ/mol	TDAs	Wlodek, Luczynski, et al., 1980	gas phase; B,M
Δ_rH°	66.9	kJ/mol	ATM	Arnold, Viggiano, et al., 1982	gas phase; Entropy change calculated or estimated; M
Δ_rH°	66.9	kJ/mol	HPMS	Lee, Keesee, et al., 1980	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	100.	J/mol*K	N/A	Arnold, Viggiano, et al., 1982	gas phase; Entropy change calculated or estimated; M
Δ_rS°	121.	J/mol*K	FA	Davidson, Fehsenfeld, et al., 1977	gas phase; M
Δ_rS°	112.	J/mol*K	HPMS	Wlodek, Luczynski, et al., 1980	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	31. ± 9.2	kJ/mol	TDAs	Davidson, Fehsenfeld, et al., 1977	gas phase; B
Δ_rG°	24.7 ± 1.7	kJ/mol	TDAs	Wlodek, Luczynski, et al., 1980	gas phase; B
Δ_rG°	29.	kJ/mol	FA	Fehsenfeld, Howard, et al., 1975	gas phase; M

Free energy of reaction

Δ_rG° (kJ/mol)	T (K)	Method	Reference	Comment
42.7	233.	ATM	Arnold, Viggiano, et al., 1982	gas phase; Entropy change calculated or estimated; M

+ = Nitric acid

By formula: NO₃^- + H⁺ = HNO₃

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	1357.7 ± 0.84	kJ/mol	TDEq	Davidson, Fehsenfeld, et al., 1977	gas phase; Relative to HBr, reevaluated with current HBr acidity. Excited state at 3.0 eV,81WU /TIE.; B
Δ_rH°	1380. ± 20.	kJ/mol	NBAE	Mathur, Rothe, et al., 1976	gas phase; From HNO₃; B
Δ_rH°	1377. ± 24.	kJ/mol	Endo	Refaey and Franklin, 1976	gas phase; I^- + HNO₃ ->.; B
Δ_rH°	1357.7 ± 2.1	kJ/mol	TDEq	Ferguson, Dunkin, et al., 1972	gas phase; B
Δ_rH°	1490.8	kJ/mol	Endo	Berkowitz, Chupka, et al., 1971	gas phase; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	1329.7 ± 0.84	kJ/mol	TDEq	Davidson, Fehsenfeld, et al., 1977	gas phase; Relative to HBr, reevaluated with current HBr acidity. Excited state at 3.0 eV,81WU /TIE.; B

( • Nitric acid ) + = ( • 2)

By formula: (Br^- • HNO₃) + HNO₃ = (Br^- • 2HNO₃)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	75.7	kJ/mol	FA	Davidson, Fehsenfeld, et al., 1977	gas phase; From thermochemical cycle(Br-/NO3- - HNO3/HBr), Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	98.7	J/mol*K	N/A	Davidson, Fehsenfeld, et al., 1977	gas phase; From thermochemical cycle(Br-/NO3- - HNO3/HBr), Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	46.4	kJ/mol	FA	Davidson, Fehsenfeld, et al., 1977	gas phase; From thermochemical cycle(Br-/NO3- - HNO3/HBr), Entropy change calculated or estimated; M

+ Nitric acid = ( • )

By formula: Br^- + HNO₃ = (Br^- • HNO₃)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	83.7	kJ/mol	FA	Davidson, Fehsenfeld, et al., 1977	gas phase; From thermochemical cycle,switching reaction(Br-/NO3-HNO3/HBr), Δ_rH>; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	77.4	J/mol*K	FA	Davidson, Fehsenfeld, et al., 1977	gas phase; From thermochemical cycle,switching reaction(Br-/NO3-HNO3/HBr), Δ_rH>; M

Free energy of reaction

Δ_rG° (kJ/mol)	T (K)	Method	Reference	Comment
56.1	367.	FA	Davidson, Fehsenfeld, et al., 1977	gas phase; From thermochemical cycle,switching reaction(Br-/NO3-HNO3/HBr), Δ_rH>; M

( • Nitric acid ) + = ( • • )

By formula: (NO₃^- • HNO₃) + H₂O = (NO₃^- • H₂O • HNO₃)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	54.4	kJ/mol	ATM	Arnold, Viggiano, et al., 1982	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	100.	J/mol*K	N/A	Arnold, Viggiano, et al., 1982	gas phase; Entropy change calculated or estimated; M

Free energy of reaction

Δ_rG° (kJ/mol)	T (K)	Method	Reference	Comment
31.	233.	ATM	Arnold, Viggiano, et al., 1982	gas phase; Entropy change calculated or estimated; M

(HO₄S^- • 2) + Nitric acid = (HO₄S^- • • 2)

By formula: (HO₄S^- • 2H₂O₄S) + HNO₃ = (HO₄S^- • HNO₃ • 2H₂O₄S)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	66.5	kJ/mol	ATM	Arnold, Viggiano, et al., 1982	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	100.	J/mol*K	N/A	Arnold, Viggiano, et al., 1982	gas phase; Entropy change calculated or estimated; M

Free energy of reaction

Δ_rG° (kJ/mol)	T (K)	Method	Reference	Comment
43.1	233.	ATM	Arnold, Viggiano, et al., 1982	gas phase; Entropy change calculated or estimated; M

(HO₄S^- • 3) + Nitric acid = (HO₄S^- • • 3)

By formula: (HO₄S^- • 3H₂O₄S) + HNO₃ = (HO₄S^- • HNO₃ • 3H₂O₄S)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	70.7	kJ/mol	ATM	Arnold, Viggiano, et al., 1982	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	100.	J/mol*K	N/A	Arnold, Viggiano, et al., 1982	gas phase; Entropy change calculated or estimated; M

Free energy of reaction

Δ_rG° (kJ/mol)	T (K)	Method	Reference	Comment
46.4	233.	ATM	Arnold, Viggiano, et al., 1982	gas phase; Entropy change calculated or estimated; M

(HO₄S^- • Nitric acid ) + HO₃S = (HO₄S^- • HO₃S • )

By formula: (HO₄S^- • HNO₃) + HO₃S = (HO₄S^- • HO₃S • HNO₃)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	90.8	kJ/mol	ATM	Arnold and Qiu, 1984	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	100.	J/mol*K	N/A	Arnold and Qiu, 1984	gas phase; Entropy change calculated or estimated; M

Free energy of reaction

Δ_rG° (kJ/mol)	T (K)	Method	Reference	Comment
64.9	250.	ATM	Arnold and Qiu, 1984	gas phase; Entropy change calculated or estimated; M

(HO₄S^- • Nitric acid ) + = (HO₄S^- • • )

By formula: (HO₄S^- • HNO₃) + H₂O = (HO₄S^- • H₂O • HNO₃)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	54.4	kJ/mol	ATM	Arnold, Viggiano, et al., 1982	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	100.	J/mol*K	N/A	Arnold, Viggiano, et al., 1982	gas phase; Entropy change calculated or estimated; M

Free energy of reaction

Δ_rG° (kJ/mol)	T (K)	Method	Reference	Comment
30.	233.	ATM	Arnold, Viggiano, et al., 1982	gas phase; Entropy change calculated or estimated; M

(HO₄S^- • Nitric acid ) + = (HO₄S^- • 2)

By formula: (HO₄S^- • HNO₃) + HNO₃ = (HO₄S^- • 2HNO₃)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	77.0	kJ/mol	ATM	Arnold, Viggiano, et al., 1982	gas phase; Entropy change calculated or estimated; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	100.	J/mol*K	N/A	Arnold, Viggiano, et al., 1982	gas phase; Entropy change calculated or estimated; M

Free energy of reaction

Δ_rG° (kJ/mol)	T (K)	Method	Reference	Comment
52.7	233.	ATM	Arnold, Viggiano, et al., 1982	gas phase; Entropy change calculated or estimated; M

( • 3 Nitric acid ) + = ( • 4)

By formula: (NO₃^- • 3HNO₃) + HNO₃ = (NO₃^- • 4HNO₃)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	39. ± 5.4	kJ/mol	TDAs	Wlodek, Luczynski, et al., 1980	gas phase; B,M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	83.3	J/mol*K	HPMS	Wlodek, Luczynski, et al., 1980	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	13.4 ± 1.7	kJ/mol	TDAs	Wlodek, Luczynski, et al., 1980	gas phase; B
Δ_rG°	29. ± 4.2	kJ/mol	IMRE	Fehsenfeld, Howard, et al., 1975	gas phase; B

( • Nitric acid ) + = ( • • )

By formula: (NO₃^- • HNO₃) + HBr = (NO₃^- • HBr • HNO₃)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	66.9	kJ/mol	FA	Davidson, Fehsenfeld, et al., 1977	gas phase; switching reaction(NO3-)2HNO3; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	95.8	J/mol*K	FA	Davidson, Fehsenfeld, et al., 1977	gas phase; switching reaction(NO3-)2HNO3; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	38.	kJ/mol	FA	Davidson, Fehsenfeld, et al., 1977	gas phase; switching reaction(NO3-)2HNO3; M

( • 5 Nitric acid ) + = ( • 6)

By formula: (NO₃^- • 5HNO₃) + HNO₃ = (NO₃^- • 6HNO₃)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	19.2 ± 3.8	kJ/mol	TDAs	Wlodek, Luczynski, et al., 1980	gas phase; B,M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	31.	J/mol*K	HPMS	Wlodek, Luczynski, et al., 1980	gas phase; Entropy change is questionable; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	10.0 ± 2.9	kJ/mol	TDAs	Wlodek, Luczynski, et al., 1980	gas phase; B

( • 4 Nitric acid ) + = ( • 5)

By formula: (NO₃^- • 4HNO₃) + HNO₃ = (NO₃^- • 5HNO₃)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	31. ± 5.0	kJ/mol	TDAs	Wlodek, Luczynski, et al., 1980	gas phase; B,M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	77.8	J/mol*K	HPMS	Wlodek, Luczynski, et al., 1980	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	7.9 ± 4.2	kJ/mol	TDAs	Wlodek, Luczynski, et al., 1980	gas phase; B

( • ) + Nitric acid = ( • • )

By formula: (NO₃^- • HBr) + HNO₃ = (NO₃^- • HNO₃ • HBr)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	66.9 ± 8.4	kJ/mol	TDEq	Davidson, Fehsenfeld, et al., 1977	gas phase; B
Quantity	Value	Units	Method	Reference	Comment
Δ_rG°	40. ± 12.	kJ/mol	TDEq	Davidson, Fehsenfeld, et al., 1977	gas phase; B

+ Nitric acid = +

By formula: C₃H₆N₂O₇ + HNO₃ = C₃H₅N₃O₉ + H₂O

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-6. ± 1.	kJ/mol	Eqk	Kazakov, Kirpichev, et al., 1990	liquid phase; Heat of nitration; ALS
Δ_rH°	-5. ± 1.	kJ/mol	Cm	Kazakov, Lagodzinskaya, et al., 1989	liquid phase; ALS

+ Nitric acid = +

By formula: C₃H₈O₃ + HNO₃ = C₃H₇NO₅ + H₂O

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-19. ± 2.	kJ/mol	Eqk	Kazakov, Kirpichev, et al., 1990	liquid phase; Heat of Nitration; ALS
Δ_rH°	-10.0	kJ/mol	Cm	Tsvetkov, Sopin, et al., 1986	liquid phase; ALS

+ Nitric acid = ( • )

By formula: NO₃^- + HNO₃ = (NO₃^- • HNO₃)

Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	100.	J/mol*K	N/A	Davidson, Fehsenfeld, et al., 1977	gas phase; Entropy change calculated or estimated, DG>, Δ_rH>; M

+ Nitric acid = ( • )

By formula: Na⁺ + HNO₃ = (Na⁺ • HNO₃)

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	86.2	kJ/mol	FA	Perry, Rowe, et al., 1980	gas phase; M
Quantity	Value	Units	Method	Reference	Comment
Δ_rS°	84.9	J/mol*K	FA	Perry, Rowe, et al., 1980	gas phase; M

+ Nitric acid = +

By formula: C₃H₇NO₅ + HNO₃ = C₃H₆N₂O₇ + H₂O

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-15. ± 3.	kJ/mol	Eqk	Kazakov, Kirpichev, et al., 1990	liquid phase; Heat of nitration; ALS

+ Nitric acid = +

By formula: C₃H₈O₃ + HNO₃ = C₃H₇NO₅ + H₂O

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-10. ± 3.	kJ/mol	Eqk	Kazakov, Kirpichev, et al., 1990	liquid phase; Heat of nitration; ALS

+ = + Nitric acid

By formula: C₃H₆N₂O₇ + H₂O = C₃H₇NO₅ + HNO₃

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	7. ± 3.	kJ/mol	Eqk	Kazakov, Kirpichev, et al., 1990	liquid phase; Heat of nitration; ALS

+ Nitric acid = +

By formula: C₃H₆N₂O₇ + HNO₃ = C₃H₅N₃O₉ + H₂O

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-10. ± 1.	kJ/mol	Eqk	Kazakov, Kirpichev, et al., 1990	liquid phase; Heat of nitration; ALS

+ 2 Nitric acid = + 2

By formula: C₃H₇NO₅ + 2HNO₃ = C₃H₅N₃O₉ + 2H₂O

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-18. ± 1.	kJ/mol	Cm	Kazakov, Lagodzinskaya, et al., 1989	liquid phase; ALS

+ 3 Nitric acid = + 3

By formula: C₃H₈O₃ + 3HNO₃ = C₃H₅N₃O₉ + 3H₂O

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-36. ± 2.	kJ/mol	Cm	Kazakov, Lagodzinskaya, et al., 1989	liquid phase; ALS

+ Nitric acid = +

By formula: C₄H₁₀O₃ + HNO₃ = C₄H₉NO₅ + H₂O

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-11.3	kJ/mol	Cm	Tsvetkov, Sopin, et al., 1986	liquid phase; ALS

+ Nitric acid = 2 +

By formula: CH₃NO₂ + HNO₃ = 2NO₂ + CH₄O

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	66.48	kJ/mol	Eqk	Silverwood and Thomas, 1967	gas phase; ALS

+ Nitric acid = C₂F₃NO₄ +

By formula: C₄F₆O₃ + HNO₃ = C₂F₃NO₄ + C₂HF₃O₂

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-27.6	kJ/mol	Cm	Tsvetkov, Shmakov, et al., 1989	liquid phase; ALS

+ Nitric acid = C₅H₁₁NO₆ +

By formula: C₅H₁₂O₄ + HNO₃ = C₅H₁₁NO₆ + H₂O

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-15.5	kJ/mol	Cm	Tsvetkov, Sopin, et al., 1986	liquid phase; ALS

+ Nitric acid = +

By formula: C₂H₆O₂ + HNO₃ = C₂H₅NO₄ + H₂O

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-7.9	kJ/mol	Cm	Tsvetkov, Sopin, et al., 1986	liquid phase; ALS

+ Nitric acid = +

By formula: C₄H₁₀O₃ + HNO₃ = C₄H₉NO₅ + H₂O

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-8.8	kJ/mol	Cm	Tsvetkov, Sopin, et al., 1986	liquid phase; ALS

+ = + Nitric acid

By formula: C₂H₃NO₄ + C₂H₄O₂ = C₄H₆O₃ + HNO₃

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	16.7	kJ/mol	Cm	Tsvetkov, Shmakov, et al., 1989	liquid phase; ALS

+ Nitric acid = +

By formula: C₃H₈O + HNO₃ = C₃H₇NO₃ + H₂O

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-23.4	kJ/mol	Eqk	Rubtsov, 1986	liquid phase; ALS

+ Nitric acid = +

By formula: CH₄O + HNO₃ = CH₃NO₃ + H₂O

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-27.6	kJ/mol	Eqk	Rubtsov, 1986	liquid phase; ALS

+ Nitric acid = +

By formula: C₂H₆O + HNO₃ = C₂H₅NO₃ + H₂O

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-25.1	kJ/mol	Eqk	Rubtsov, 1986	liquid phase; ALS

+ Nitric acid = +

By formula: C₃H₈O + HNO₃ = C₃H₇NO₃ + H₂O

Quantity	Value	Units	Method	Reference	Comment
Δ_rH°	-21.8	kJ/mol	Eqk	Rubtsov, 1986	liquid phase; ALS

Henry's Law data

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

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)

k°_H (mol/(kg*bar))	d(ln(k_H))/d(1/T) (K)	Method	Reference	Comment
210000.	8700.	R	N/A	missing citation assume the temperature dependence to be the same as for a(H⁺) a(NO₃^-) / p(HNO₃) in missing citation.
2.4×10⁺⁶/K_A	8700.	T	N/A	For strong acids, the solubility is often expressed as k_H = ([H⁺] * [A^-]) / p(HA). To obtain the physical solubility of HA, the value has to be divided by the acidity constant K_A. missing citation corrects erroneous data from missing citation.
2.6×10⁺⁶	8700.	T	N/A
350000./K_A	8700.	Q	N/A	For strong acids, the solubility is often expressed as k_H = ([H⁺] * [A^-]) / p(HA). To obtain the physical solubility of HA, the value has to be divided by the acidity constant K_A. missing citation refer to several references in their list of Henry's law constants but they don't assign them to specific species.
89000.		C	N/A
210000.		T	N/A

References

Go To: Top, Phase change data, Reaction thermochemistry data, Henry's Law data, Notes

Holeci, 1966
Holeci, I., Chem. Prum., 1966, 16, 5, 267. [all data]

Davidson, Fehsenfeld, et al., 1977
Davidson, J.A.; Fehsenfeld, F.C.; Howard, C.J., The heats of formation of NO₃- and NO₃- association complexes with HNO₃ and HBr, Int. J. Chem. Kinet., 1977, 9, 17. [all data]

Wlodek, Luczynski, et al., 1980
Wlodek, S.; Luczynski, Z.; Wincel, H., Stabilities of gas-phase NO₃-.(HNO₃)n,n ≤ 6, clusters, Int. J. Mass Spectrom. Ion Phys., 1980, 35, 39. [all data]

Arnold, Viggiano, et al., 1982
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Notes

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Symbols used in this document:

T	Temperature
d(ln(k_H))/d(1/T)	Temperature dependence parameter for Henry's Law constant
k°_H	Henry's Law constant at 298.15K
Δ_rG°	Free energy of reaction at standard conditions
Δ_rH°	Enthalpy of reaction at standard conditions
Δ_rS°	Entropy of reaction at standard conditions
Δ_vapH	Enthalpy of vaporization

Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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