Nitric acid

• Formula: HNO₃
• Molecular weight: 63.0128
• IUPAC Standard InChI: InChI=1S/HNO3/c2-1(3)4/h(H,2,3,4) Copy

  
• IUPAC Standard InChIKey: GRYLNZFGIOXLOG-UHFFFAOYSA-N Copy
• CAS Registry Number: 7697-37-2
• Chemical structure:
  This structure is also available as a 2d Mol file or as a computed 3d SD file
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• Information on this page:
  • Gas phase thermochemistry data
  • Phase change data
  • Reaction thermochemistry data
  • Henry's Law data
  • Gas phase ion energetics data
  • Ion clustering data
  • IR Spectrum
  • Vibrational and/or electronic energy levels
  • References
  • Notes
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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.

Gas Phase Heat Capacity (Shomate Equation)

C_p° = 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
    C_p = heat capacity (J/mol*K)
    H° = standard enthalpy (kJ/mol)
    S° = standard entropy (J/mol*K)
    t = temperature (K) / 1000.

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Phase change 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: William E. Acree, Jr., James S. Chickos

Enthalpy of vaporization

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
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias
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

( • ) +  = ( • 2)

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

Free energy of reaction

( • 2) +  = ( • 3)

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

Free energy of reaction

 +  =

By formula: NO₃^- + H⁺ = HNO₃

( • ) +  = ( • 2)

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

 +  = ( • )

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

Free energy of reaction

( • ) +  = ( •  • )

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

Free energy of reaction

(HO₄S^- • 2) +  = (HO₄S^- •  • 2)

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

Free energy of reaction

(HO₄S^- • 3) +  = (HO₄S^- •  • 3)

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

Free energy of reaction

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

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

Free energy of reaction

(HO₄S^- • ) +  = (HO₄S^- •  • )

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

Free energy of reaction

(HO₄S^- • ) +  = (HO₄S^- • 2)

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

Free energy of reaction

( • 3) +  = ( • 4)

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

( • ) +  = ( •  • )

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

( • 5) +  = ( • 6)

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

( • 4) +  = ( • 5)

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

( • ) +  = ( •  • )

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

 +  =  + 

By formula: C₃H₆N₂O₇ + HNO₃ = C₃H₅N₃O₉ + H₂O

 +  =  + 

By formula: C₃H₈O₃ + HNO₃ = C₃H₇NO₅ + H₂O

 +  = ( • )

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

 +  = ( • )

By formula: Na⁺ + HNO₃ = (Na⁺ • HNO₃)

 +  =  + 

By formula: C₃H₇NO₅ + HNO₃ = C₃H₆N₂O₇ + H₂O

 +  =  + 

By formula: C₃H₈O₃ + HNO₃ = C₃H₇NO₅ + H₂O

 +  =  + 

By formula: C₃H₆N₂O₇ + H₂O = C₃H₇NO₅ + HNO₃

 +  =  + 

By formula: C₃H₆N₂O₇ + HNO₃ = C₃H₅N₃O₉ + H₂O

 + 2 =  + 2

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

 + 3 =  + 3

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

 +  =  + 

By formula: C₄H₁₀O₃ + HNO₃ = C₄H₉NO₅ + H₂O

 +  = 2 + 

By formula: CH₃NO₂ + HNO₃ = 2NO₂ + CH₄O

 +  = C₂F₃NO₄ + 

By formula: C₄F₆O₃ + HNO₃ = C₂F₃NO₄ + C₂HF₃O₂

 +  = C₅H₁₁NO₆ + 

By formula: C₅H₁₂O₄ + HNO₃ = C₅H₁₁NO₆ + H₂O

 +  =  + 

By formula: C₂H₆O₂ + HNO₃ = C₂H₅NO₄ + H₂O

 +  =  + 

By formula: C₄H₁₀O₃ + HNO₃ = C₄H₉NO₅ + H₂O

 +  =  + 

By formula: C₂H₃NO₄ + C₂H₄O₂ = C₄H₆O₃ + HNO₃

 +  =  + 

By formula: C₃H₈O + HNO₃ = C₃H₇NO₃ + H₂O

 +  =  + 

By formula: CH₄O + HNO₃ = CH₃NO₃ + H₂O

 +  =  + 

By formula: C₂H₆O + HNO₃ = C₂H₅NO₃ + H₂O

 +  =  + 

By formula: C₃H₈O + HNO₃ = C₃H₇NO₃ + H₂O

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)

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)

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 evaluated as indicated in comments:
HL - Edward P. Hunter and Sharon G. Lias

Data compiled as indicated in comments:
B - John E. Bartmess
MM - Michael M. Meot-Ner (Mautner)
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
LL - Sharon G. Lias and Joel F. Liebman

Electron affinity determinations

Proton affinity at 298K

Ionization energy determinations

Appearance energy determinations

De-protonation reactions

 +  =

By formula: NO₃^- + H⁺ = HNO₃

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 as indicated in comments:
M - Michael M. Meot-Ner (Mautner) and Sharon G. Lias
B - 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

 +  = ( • )

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

Free energy of reaction

( • ) +  = ( • 2)

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

(HO₄S^- • ) +  = (HO₄S^- • 2)

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

Free energy of reaction

(HO₄S^- • 2) +  = (HO₄S^- •  • 2)

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

Free energy of reaction

(HO₄S^- • 3) +  = (HO₄S^- •  • 3)

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

Free energy of reaction

( • ) +  = ( •  • )

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

 +  = ( • )

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

( • ) +  = ( • 2)

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

Free energy of reaction

( • 2) +  = ( • 3)

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

Free energy of reaction

( • 3) +  = ( • 4)

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

( • 4) +  = ( • 5)

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

( • 5) +  = ( • 6)

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

 +  = ( • )

By formula: Na⁺ + HNO₃ = (Na⁺ • HNO₃)

IR Spectrum

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Data compiled by: Tanya L. Myers, Russell G. Tonkyn, Ashley M. Oeck, Tyler O. Danby, John S. Loring, Matthew S. Taubman, Stephen W. Sharpe, Jerome C. Birnbaum, and Timothy J. Johnson

• liquid; Bruker Tensor 37 FTIR
  0.48208331, 0.48208331, 0.48208331 cm^-1 resolution

Vibrational and/or electronic energy levels

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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: Marilyn E. Jacox

State:   ?

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State:   X

Additional references: Jacox, 1994, page 271; Jacox, 1998, page 289; Jacox, 2003, page 274; Millen and Morton, 1960; Cox and Riveros, 1965; Johnston, Chang, et al., 1974; Cazzoli and De Lucia, 1979; Bowman, Helminger, et al., 1981; Ghosh, Blom, et al., 1981; Margitan and Watson, 1982; Messer, De Lucia, et al., 1984; Crownover, Booker, et al., 1988; Tan, Looi, et al., 1991; Tan, Looi, et al., 1991, 2; Turnipseed, Vaghjiani, et al., 1992; Maki, Tan, et al., 1993; Schiffman, Nelson, et al., 1993; Tan, Looi, et al., 1994; Cox, Ellis, et al., 1994; Chou, Petkie, et al., 2002; Petkie, Helminger, et al., 2003

Notes

References

Go To: Top, Gas phase thermochemistry data, Phase change data, Reaction thermochemistry data, Henry's Law data, Gas phase ion energetics data, Ion clustering data, IR Spectrum, Vibrational and/or electronic energy levels, NIST Free Links, NIST Subscription Links, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Chase, 1998
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Jochims, H.-W.; Denzer, W.; Baumgartel, H.; Losking, O.; Willner, H., Photochemical decay reactions of N₂O₅, HNO₃, ClNO₃ and BrNO₃ in the energy range 10-20 eV, Ber. Bunsen-Ges. Phys. Chem., 1992, 96, 573. [all data]

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Cheng, B.-M.; Lee, J.-W.; Lee, Y.-P., Photolysis of nitric acid in solid argon: the infrared absorption of peroxynitrous acid (HOONO), J. Phys. Chem., 1991, 95, 7, 2814, https://doi.org/10.1021/j100160a034 . [all data]

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Chen, W.-J.; Lo, W.-J.; Cheng, B.-M.; Lee, Y.-P., Photolysis of nitric acid in solid nitrogen, J. Chem. Phys., 1992, 97, 10, 7167, https://doi.org/10.1063/1.463541 . [all data]

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Notes

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• Symbols used in this document:
  

  AE	Appearance energy
  EA	Electron affinity
  S°gas,1 bar	Entropy of gas at standard conditions (1 bar)
  T	Temperature
  d(ln(kH))/d(1/T)	Temperature dependence parameter for Henry's Law constant
  k°H	Henry's Law constant at 298.15K
  ΔfH°gas	Enthalpy of formation of gas at standard conditions
  ΔrG°	Free energy of reaction at standard conditions
  ΔrH°	Enthalpy of reaction at standard conditions
  ΔrS°	Entropy of reaction at standard conditions
  ΔvapH	Enthalpy of vaporization

• Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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