Malic Acid
- Formula: C4H6O5
- Molecular weight: 134.0874
- IUPAC Standard InChI: InChI=1S/C4H6O5/c5-2(4(8)9)1-3(6)7/h2,5H,1H2,(H,6,7)(H,8,9)
- IUPAC Standard InChIKey: BJEPYKJPYRNKOW-UHFFFAOYSA-N
- CAS Registry Number: 6915-15-7
- 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. - Stereoisomers:
- Other names: Butanedioic acid, hydroxy-; α-Hydroxysuccinic acid; Hydroxyethane-1,2-dicarboxylic acid; Hydroxysuccinic acid; Pomalus acid; dl-Malic acid; Deoxytetraric acid; Kyselina hydroxybutandiova; Kyselina jablecna; Succinic acid, hydroxy-; Hydroxybutanedioic acid; (.+/-.)-Malic acid; 2-Hydroxyethane-1,2-dicarboxylic acid; Butanedioic acid, 2-hydroxy-; FDA 2018; Musashi-no-Ringosan; NSC 25941; R,S(.+/-.)-Malic acid; Apple acid (Salt/Mix)
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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 as indicated in comments:
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director
DH - Eugene S. Domalski and Elizabeth D. Hearing
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| Tfus | 400.75 | K | N/A | Wilhoit and Shiao, 1964 | Uncertainty assigned by TRC = 0.6 K; TRC |
Enthalpy of phase transition
| ΔHtrs (kcal/mol) | Temperature (K) | Initial Phase | Final Phase | Reference | Comment |
|---|---|---|---|---|---|
| 8.0120 | 402. | crystaline, I | liquid | Ceolin, Szwarc, et al., 1990 | Stable form I.; DH |
| 7.2108 | 396. | crystaline, II | liquid | Ceolin, Szwarc, et al., 1990 | Stable form II.; DH |
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.
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. [all data]
Ceolin, Szwarc, et al., 1990
Ceolin, R.; Szwarc, H.; Lepage, F.,
On the dimorphism of DL-malic acid,
Thermochim. Acta, 1990, 158(2), 347-352. [all data]
Notes
Go To: Top, Phase change data, References
- Symbols used in this document:
Tfus Fusion (melting) point ΔHtrs Enthalpy of phase transition - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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