Oxalic acid
- Formula: C2H2O4
- Molecular weight: 90.0349
- IUPAC Standard InChI: InChI=1S/C2H2O4/c3-1(4)2(5)6/h(H,3,4)(H,5,6)
- IUPAC Standard InChIKey: MUBZPKHOEPUJKR-UHFFFAOYSA-N
- CAS Registry Number: 144-62-7
- 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. - Other names: Ethanedioic acid; Aktisal; Aquisal; Oxiric acid; HOOCCOOH; Acide oxalique; Acido ossalico; Ethanedionic acid; Kyselina stavelova; NCI-C55209; Oxaalzuur; Oxalsaeure; Ethane-1,2-dioic acid; NSC 62774
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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°solid | -828.93 ± 0.46 | kJ/mol | Cm | Brown, 1969 | ALS |
| ΔfH°solid | -829.94 ± 0.96 | kJ/mol | Ccb | Wilhoit and Shiao, 1964 | ALS |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔcH°solid | -242.9 ± 0.92 | kJ/mol | Ccb | Wilhoit and Shiao, 1964 | Corresponding ΔfHºsolid = -829.94 kJ/mol (simple calculation by NIST; no Washburn corrections); ALS |
| ΔcH°solid | -253.5 ± 0.46 | kJ/mol | Ccb | Verkade, Hartman, et al., 1926 | Reanalyzed by Cox and Pilcher, 1970, Original value = -251. kJ/mol; See Verkade, Hartman, et al., 1924; Corresponding ΔfHºsolid = -819.35 kJ/mol (simple calculation by NIST; no Washburn corrections); ALS |
| Quantity | Value | Units | Method | Reference | Comment |
| S°solid,1 bar | 115.6 | J/mol*K | N/A | Luff and Reed, 1982 | DH |
Constant pressure heat capacity of solid
| Cp,solid (J/mol*K) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 105.9 | 298.15 | Luff and Reed, 1982 | T = 5 to 320 K.; DH |
| 146. | 340. | David, 1964 | T = 298 to 373 K. Mean value. T = uncertain.; DH |
| 118.0 | 323. | Satoh and Sogabe, 1939 | T = 0 to 100°C. Mean value given.; DH |
| 120.1 | 298.1 | Parks, Kelley, et al., 1929 | Extrapolation below 90 K, 38.49 J/mol*K. Revision of previous data.; 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.
Brown, 1969
Brown, M.A.H.,
The heats of formation of selected cyanide and oxalate compounds,
Diss. Abstr., 1969, 29, 3696. [all data]
Wilhoit and Shiao, 1964
Wilhoit, R.C.; Shiao, D.,
Thermochemistry of biologically important compounds. Heats of combustion of solid organic acids.,
J. Chem. Eng. Data, 1964, 9, 595-599. [all data]
Verkade, Hartman, et al., 1926
Verkade, P.E.; Hartman, H.; Coops, J.,
Calorimetric researches. X. Heats of combustion of successive terms of homologous series: dicarboxylic acids of the oxalic acid series,
Rec. Trav. Chim. Pays/Bas, 1926, 45, 373-393. [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]
Verkade, Hartman, et al., 1924
Verkade, P.E.; Hartman, H.; Coops, J., Jr.,
Chemistry - The molecular heat of combustion of successive terms of homologous series,
Kom. Med. Akad. Ueknschap. Proc., 1924, 27, 859-866. [all data]
Luff and Reed, 1982
Luff, B.B.; Reed, R.B.,
Low-temperature heat capacity and entropy of oxalic acid and of biuret,
J. Chem. Eng. Data, 1982, 27, 290-292. [all data]
David, 1964
David, D.J.,
Determination of specific heat and heat of fusion by differential thermal analysis. Study of theory and operating parameters,
Anal. Chem., 1964, 36, 2162-2166. [all data]
Satoh and Sogabe, 1939
Satoh, S.; Sogabe, T.,
The specific heats of some solid aliphatic acids and their ammonium salts and the atomic heat of nitrogen,
Sci. Pap. Inst. Phys. Chem. Res. (Tokyo), 1939, 36, 97-105. [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]
Notes
Go To: Top, Condensed phase thermochemistry data, References
- Symbols used in this document:
Cp,solid Constant pressure heat capacity of solid S°solid,1 bar Entropy of solid at standard conditions (1 bar) ΔcH°solid Enthalpy of combustion of solid at standard conditions ΔfH°solid Enthalpy of formation of solid at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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