Acetic acid
- Formula: C2H4O2
- Molecular weight: 60.0520
- IUPAC Standard InChI: InChI=1S/C2H4O2/c1-2(3)4/h1H3,(H,3,4)
- IUPAC Standard InChIKey: QTBSBXVTEAMEQO-UHFFFAOYSA-N
- CAS Registry Number: 64-19-7
- 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. - Isotopologues:
- Other names: Ethanoic acid; Ethylic acid; Glacial acetic acid; Methanecarboxylic acid; Vinegar acid; CH3COOH; Acetasol; Acide acetique; Acido acetico; Azijnzuur; Essigsaeure; Octowy kwas; Acetic acid, glacial; Kyselina octova; UN 2789; Aci-jel; Shotgun; Ethanoic acid monomer; NSC 132953
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- Information on this page:
- Other data available:
- Gas phase thermochemistry data
- Phase change data
- Reaction thermochemistry data: reactions 1 to 50, reactions 51 to 79
- Henry's Law data
- Gas phase ion energetics data
- Ion clustering data
- IR Spectrum
- Mass spectrum (electron ionization)
- UV/Visible spectrum
- Vibrational and/or electronic energy levels
- Gas Chromatography
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Condensed phase thermochemistry data
Go To: Top, 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:
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
DH - Eugene S. Domalski and Elizabeth D. Hearing
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔfH°liquid | -115.56 ± 0.086 | kcal/mol | Ccb | Steele, Chirico, et al., 1997 | ALS |
| ΔfH°liquid | -115.80 ± 0.05 | kcal/mol | Ccb | Lebedeva, 1964 | ALS |
| ΔfH°liquid | -115.7 ± 0.1 | kcal/mol | Ccb | Evans and Skinner, 1959 | ALS |
| ΔfH°liquid | -116.4 | kcal/mol | Cm | Carson and Skinner, 1949 | Unpublished result by Rossini; ALS |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔcH°liquid | -209.17 ± 0.081 | kcal/mol | Ccb | Steele, Chirico, et al., 1997 | Corresponding ΔfHºliquid = -115.56 kcal/mol (simple calculation by NIST; no Washburn corrections); ALS |
| ΔcH°liquid | -208.94 ± 0.05 | kcal/mol | Ccb | Lebedeva, 1964 | Corresponding ΔfHºliquid = -115.79 kcal/mol (simple calculation by NIST; no Washburn corrections); ALS |
| ΔcH°liquid | -209.0 ± 0.1 | kcal/mol | Ccb | Evans and Skinner, 1959 | Corresponding ΔfHºliquid = -115.7 kcal/mol (simple calculation by NIST; no Washburn corrections); ALS |
| ΔcH°liquid | -208.5 | kcal/mol | Ccb | Schjanberg, 1935 | Corresponding ΔfHºliquid = -116.2 kcal/mol (simple calculation by NIST; no Washburn corrections); ALS |
| Quantity | Value | Units | Method | Reference | Comment |
| S°liquid | 37.76 | cal/mol*K | N/A | Martin and Andon, 1982 | DH |
| S°liquid | 46.30 | cal/mol*K | N/A | Parks and Kelley, 1925 | Extrapolation below 90 K. 76.82 J/mol*K.; DH |
Constant pressure heat capacity of liquid
| Cp,liquid (cal/mol*K) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 29.42 | 298.15 | Martin and Andon, 1982 | T = 13 to 450 K. Data also given by equation.; DH |
| 33.39 | 332. | Swietoslawski and Zielenkiewicz, 1958 | Mean value 22 to 96°C.; DH |
| 28.80 | 298. | Radulescu and Jula, 1934 | DH |
| 28.99 | 297.1 | Neumann, 1932 | T = 23.9 to 80.5°C. Value is unsmoothed experimental datum.; DH |
| 38.19 | 298.1 | Parks, Kelley, et al., 1929 | Extrapolation below 90 K, 42.68 J/mol*K. Revision of previous data.; DH |
| 29.49 | 294.7 | Parks and Kelley, 1925 | T = 87 to 295 K. Value is unsmoothed experimental datum.; DH |
| 32.7 | 287. - 335. | Pickering, 1895 | T = 260 to 335 K.; DH |
| 29.52 | 298. | von Reis, 1881 | T = 292 to 358 K.; DH |
References
Go To: Top, Condensed phase thermochemistry data, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Steele, Chirico, et al., 1997
Steele, W.V.; Chirico, R.D.; Cowell, A.B.; Knipmeyer, S.E.; Nguyen, A.,
Thermodynamic properties and ideal-gas enthalpies of formation for 2-aminoisobutyric acid (2-methylalanine), acetic acid, (4-methyl-3-penten-2-one), 4-methylpent-1-ene, 2,2'-bis(phenylthio)propane, and glycidyl phenyl ether (1,2-epoxy-3-phenoxypropane),
J. Chem. Eng. Data, 1997, 42, 1052-1066. [all data]
Lebedeva, 1964
Lebedeva, N.D.,
Heats of combustion of monocarboxylic acids,
Russ. J. Phys. Chem. (Engl. Transl.), 1964, 38, 1435-1437. [all data]
Evans and Skinner, 1959
Evans, F.W.; Skinner, H.A.,
The heat of combustion of acetic acid,
Trans. Faraday Soc., 1959, 55, 260-261. [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]
Schjanberg, 1935
Schjanberg, E.,
Die Verbrennungswarmen und die Refraktionsdaten einiger chlorsubstituierter Fettsauren und Ester.,
Z. Phys. Chem. Abt. A, 1935, 172, 197-233. [all data]
Martin and Andon, 1982
Martin, J.F.; Andon, R.J.L.,
Thermodynamic properties of organic oxygen compounds. Part LII. Molar heat capacity of ethanoic, propanoic, and butanoic acids,
J. Chem. Thermodynam., 1982, 14, 679-688. [all data]
Parks and Kelley, 1925
Parks, G.S.; Kelley, K.K.,
Thermal data on organic compounds. II. The heat capacities of five organic compounds. The entropies and free energies of some homologous series of aliphatic compounds,
J. Am. Chem. Soc., 1925, 47, 2089-2097. [all data]
Swietoslawski and Zielenkiewicz, 1958
Swietoslawski, W.; Zielenkiewicz, A.,
Mean specific heat of some ternary azeotropes,
Bull. Acad. Pol. Sci. Ser. Sci. Chim., 1958, 6, 365-366. [all data]
Radulescu and Jula, 1934
Radulescu, D.; Jula, O.,
Beiträge zur Bestimmung der Abstufung der Polarität des Aminstickstoffes in den organischen Verbindungen,
Z. Phys. Chem., 1934, B26, 390-393. [all data]
Neumann, 1932
Neumann, M.B.,
Die Untersuchung der Wärmekapazität vom binären System CH3COOH + H2O bei verschiedenen Temperaturen,
Z. Phys. Chem., 1932, A158, 258-264. [all data]
Parks, Kelley, et al., 1929
Parks, G.S.; Kelley, K.K.; Huffman, H.M.,
Thermal data on organic compounds. V. A revision of the entropies and free energies of nineteen organic compounds,
J. Am. Chem. Soc., 1929, 51, 1969-1973. [all data]
Pickering, 1895
Pickering, S.U.,
A comparison of some properties of acetic acid and its chloro- and bromo-derivatives,
J. Chem. Soc., 1895, 67, 664-684. [all data]
von Reis, 1881
von Reis, M.A.,
Die specifische Wärme flüssiger organischer Verbindungen und ihre Beziehung zu deren Moleculargewicht,
Ann. Physik [3], 1881, 13, 447-464. [all data]
Notes
Go To: Top, Condensed phase thermochemistry data, References
- Symbols used in this document:
Cp,liquid Constant pressure heat capacity of liquid S°liquid Entropy of liquid at standard conditions ΔcH°liquid Enthalpy of combustion of liquid at standard conditions ΔfH°liquid Enthalpy of formation of liquid at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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