Sodium hydroxide

• Formula: HNaO
• Molecular weight: 39.9971
• IUPAC Standard InChI: InChI=1S/Na.H2O/h;1H2/q+1;/p-1 Copy

  
• IUPAC Standard InChIKey: HEMHJVSKTPXQMS-UHFFFAOYSA-M Copy
• CAS Registry Number: 1310-73-2
• Chemical structure:
  This structure is also available as a 2d Mol file or as a computed 3d SD file
  The 3d structure may be viewed using Java or Javascript.
• Species with the same structure:
  • Sodium hydroxide
• Information on this page:
  • Gas phase thermochemistry data
  • Condensed phase thermochemistry data
  • Reaction thermochemistry data
  • Gas phase ion energetics data
  • References
  • Notes
• Data at other public NIST sites:
  • Microwave spectra (on physics lab web site)
  • Gas Phase Kinetics Database
  • X-ray Photoelectron Spectroscopy Database, version 5.0
• Options:
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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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Condensed 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.

Liquid 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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Solid 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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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:
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
MS - José A. Martinho Simões

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: 2HNaO + C₂H₃FO = C₂H₃NaO₂ + FNa + H₂O

2 +  =  + 2 + 2

By formula: 2HNaO + C₂H₆O₄ = H₂ + 2CHNaO₂ + 2H₂O

 +  =

By formula: HNaO + C₂H₂O = C₂H₃NaO₂

C₂Na₂ (cr) + 2 (l) = 2( • 1418) (solution) +  (g)

By formula: C₂Na₂ (cr) + 2H₂O (l) = 2(HNaO • 1418H₂O) (solution) + C₂H₂ (g)

C₂HNa (cr) +  (l) = ( • 1418) (solution) +  (g)

By formula: C₂HNa (cr) + H₂O (l) = (HNaO • 1418H₂O) (solution) + C₂H₂ (g)

3 +  = CNa₂O₃ +  +  + 

By formula: 3HNaO + C₃H₅ClO₂ = CNa₂O₃ + C₂H₆O + ClNa + H₂O

2 +  =  +  + CNO.Na

By formula: 2HNaO + CBrN = BrNa + H₂O + CNO.Na

2 +  =  +  + CNO.Na

By formula: 2HNaO + CIN = INa + H₂O + CNO.Na

2 +  =  +  + CNO.Na

By formula: 2HNaO + CClN = ClNa + H₂O + CNO.Na

 +  =  + 

By formula: C₂HBr₃O + HNaO = CHNaO₂ + CHBr₃

 +  =  + 

By formula: HNaO + C₂HCl₃O = CHNaO₂ + CHCl₃

 +  =  + 

By formula: HNaO + C₂H₅NO = C₂H₃NaO₂ + H₃N

C₆H₅NaO (cr) +  (l) =  (cr) +  (cr)

By formula: C₆H₅NaO (cr) + H₂O (l) = C₆H₆O (cr) + HNaO (cr)

C₂H₅NaO (cr) +  (l) =  (cr) +  (l)

By formula: C₂H₅NaO (cr) + H₂O (l) = HNaO (cr) + C₂H₆O (l)

 (cr) +  (l) =  (cr) +  (l)

By formula: CH₃NaO (cr) + H₂O (l) = HNaO (cr) + CH₄O (l)

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 by: Edward P. Hunter and Sharon G. Lias

References

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Reaction thermochemistry 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.

Chase, 1998
Chase, M.W., Jr., NIST-JANAF Themochemical Tables, Fourth Edition, J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]

Pritchard and Skinner, 1950
Pritchard, H.O.; Skinner, H.A., The heat of hydrolysis of acetyl fluoride, J. Chem. Soc., 1950, 1099. [all data]

Carson and Skinner, 1949
Carson, A.S.; Skinner, H.A., 201. Carbon-halogen bond energies in the acetyl halides, J. Chem. Soc., 1949, 936-939. [all data]

Jenkins and Style, 1953
Jenkins, A.D.; Style, D.W.G., The thermochemistry and pyrolysis of bishydroxymethyl, J. Chem. Soc., 1953, 2337-23. [all data]

Cox and Pilcher, 1970
Cox, J.D.; Pilcher, G., Thermochemistry of Organic and Organometallic Compounds, Academic Press, New York, 1970, 1-636. [all data]

Nuttall, Laufer, et al., 1971
Nuttall, R.L.; Laufer, A.H.; Kilday, M.V., The enthalpy of formation of ketene, J. Chem. Thermodyn., 1971, 3, 167-174. [all data]

Rice and Greenberg, 1934
Rice, F.O.; Greenberg, J., Ketene. III. Heat of formation and heat of reaction with alcohols, J. Am. Chem. Soc., 1934, 38, 2268-2270. [all data]

Johnson, van Deventer, et al., 1973
Johnson, G.K.; van Deventer, E.H.; Ackerman, J.P.; Hubbard, W.N.; Osborne, D.W.; Flotow, H.L., J. Chem. Thermodyn., 1973, 5, 57. [all data]

Pedley and Rylance, 1977
Pedley, J.B.; Rylance, J., Computer Analysed Thermochemical Data: Organic and Organometallic Compounds, University of Sussex, Brigton, 1977. [all data]

Davies, Finch, et al., 1980
Davies, R.H.; Finch, A.; Gardner, P.J., The standard enthalpy of formation of liquid and gaseous ethylchloroformate (C₃H₅O₂Cl), J. Chem. Thermodyn., 1980, 12, 291-296. [all data]

Lord and Woolf, 1954
Lord, G.; Woolf, A.A., The cyanogen halides. Part III. Their heats of formation and free energies, J. Chem. Soc., 1954, 2546-2551. [all data]

Pritchard and Skinner, 1950, 2
Pritchard, H.O.; Skinner, H.A., The heats of hydrolysis of chloral and bromal, and the C-C bond dissociation energies in chloral and bromal, J. Am. Chem. Soc., 1950, 1928-1931. [all data]

Calvet, 1933
Calvet, E., Mesures thermochimiques directes en chimie organique vitesses et chaleurs de saponification des amides. II.-Mesures effectuees et resultats obtenus, J. Chim. Phys., 1933, 30, 140-146. [all data]

Leal, Pires de Matos, et al., 1991
Leal, J.P.; Pires de Matos, A.; Martinho Simões, J.A., J. Organometal. Chem., 1991, 403, 1. [all data]

Hunter and Lias, 1998
Hunter, E.P.; Lias, S.G., Evaluated Gas Phase Basicities and Proton Affinities of Molecules: An Update, J. Phys. Chem. Ref. Data, 1998, 27, 3, 413-656, https://doi.org/10.1063/1.556018 . [all data]

Notes

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, References

• Symbols used in this document:
  

  S°gas,1 bar	Entropy of gas at standard conditions (1 bar)
  S°liquid,1 bar	Entropy of liquid at standard conditions (1 bar)
  S°solid	Entropy of solid at standard conditions
  ΔfH°gas	Enthalpy of formation of gas at standard conditions
  ΔfH°liquid	Enthalpy of formation of liquid at standard conditions
  ΔfH°solid	Enthalpy of formation of solid at standard conditions
  ΔrH°	Enthalpy of reaction at standard conditions

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