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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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.
Data compiled by: Glushko Thermocenter, Russian Academy of Sciences, Moscow
Constant pressure heat capacity of gas
| Cp,gas (J/mol*K) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 38.40 | 50. | Dorofeeva O.V., 1997 | p=1 bar. |
| 45.04 | 100. | ||
| 54.32 | 150. | ||
| 65.10 | 200. | ||
| 85. ± 5. | 298.15 | ||
| 85.52 | 300. | ||
| 102.17 | 400. | ||
| 115.25 | 500. | ||
| 125.47 | 600. | ||
| 133.54 | 700. | ||
| 140.04 | 800. | ||
| 145.36 | 900. | ||
| 149.79 | 1000. | ||
| 153.53 | 1100. | ||
| 156.71 | 1200. | ||
| 159.44 | 1300. | ||
| 161.80 | 1400. | ||
| 163.84 | 1500. |
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
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
C2HO4- + =
By formula: C2HO4- + H+ = C2H2O4
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 1356. ± 8.4 | kJ/mol | CIDC | Kumar, Prabhakar, et al., 2005 | gas phase; B |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrG° | 1323. ± 8.4 | kJ/mol | CIDC | Kumar, Prabhakar, et al., 2005 | gas phase; B |
+ 2
=
+ 2
By formula: C4H6O4 + 2H2O = C2H2O4 + 2CH4O
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 17.428 ± 0.065 | kJ/mol | Cm | Anthoney, Finch, et al., 1975 | solid phase; solvent: Water; Hydrolysis; ALS |
Gas Chromatography
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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: NIST Mass Spectrometry Data Center, William E. Wallace, director
Normal alkane RI, non-polar column, temperature ramp
| Column type | Active phase | I | Reference | Comment |
|---|---|---|---|---|
| Capillary | RTX-5 | 748. | Setkova, Risticevic, et al., 2007 | 10. m/0.18 mm/0.2 μm, He, 40. C @ 0.5 min, 50. K/min, 275. C @ 0.5 min |
References
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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Dorofeeva O.V., 1997
Dorofeeva O.V.,
Unpublished results. Thermocenter of Russian Academy of Science, Moscow, 1997. [all data]
Kumar, Prabhakar, et al., 2005
Kumar, M.R.; Prabhakar, S.; Nagaveni, V.; Vairamani, M.,
Estimation of gas-phase acidities of a series of dicarboxylic acids by the kinetic method,
Rapid Commun. Mass Spectrom., 2005, 19, 8, 1053-1057, https://doi.org/10.1002/rcm.1888
. [all data]
Anthoney, Finch, et al., 1975
Anthoney, M.E.; Finch, A.; Stephens, M.,
The solution of dimethyl oxalate and oxalic acid in water and alkali. Standard enthalpy of formation of dimethyl oxalate,
Thermochim. Acta, 1975, 12, 427-431. [all data]
Setkova, Risticevic, et al., 2007
Setkova, L.; Risticevic, S.; Pawliszyn, J.,
Rapid headspace solid-phase microextraction-gas chromatographic?time-of-flight mass spectrometric method for qualitative profiling of ice wine volatile fraction II: Classification of Canadian and Czech ice wines using statistical evaluation of the data,
J. Chromatogr. A, 2007, 1147, 2, 224-240, https://doi.org/10.1016/j.chroma.2007.02.052
. [all data]
Notes
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- Symbols used in this document:
Cp,gas Constant pressure heat capacity of gas ΔrG° Free energy of reaction at standard conditions ΔrH° Enthalpy of reaction at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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