Lactic acid
- Formula: C3H6O3
- Molecular weight: 90.0779
- IUPAC Standard InChI: InChI=1S/C3H6O3/c1-2(4)3(5)6/h2,4H,1H3,(H,5,6)
- IUPAC Standard InChIKey: JVTAAEKCZFNVCJ-UHFFFAOYSA-N
- CAS Registry Number: 50-21-5
- 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:
- Stereoisomers:
- Other names: Propanoic acid, 2-hydroxy-; α-Hydroxypropanoic acid; α-Hydroxypropionic acid; Milk acid; 2-Hydroxypropionic acid; Ethylidenelactic acid; 1-Hydroxyethanecarboxylic acid; 2-Hydroxypropanoic acid; Kyselina 2-hydroxypropanova; Kyselina mlecna; DL-Lactic acid; Milchsaure; Ordinary lactic acid; Propionic acid, 2-hydroxy-; Racemic lactic acid; 1-Hydroxyethane 1-carboxylic acid; Purac FCC 80; (.+/-.)-Lactic acid; NSC 367919; Tonsillosan
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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.
Data compiled by: Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔcH°solid | -1362.8 | kJ/mol | Ccb | Meyerhof, 1922 | Corresponding ΔfHºsolid = -675.21 kJ/mol (simple calculation by NIST; no Washburn corrections) |
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
AC - William E. Acree, Jr., James S. Chickos
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| Tfus | 290. | K | N/A | Yoshida, 1944 | Uncertainty assigned by TRC = 2. K; TRC |
| Quantity | Value | Units | Method | Reference | Comment |
| Ttriple | 290. | K | N/A | Wilhoit, Chao, et al., 1985 | Uncertainty assigned by TRC = 0.2 K; TRC |
Enthalpy of fusion
| ΔfusH (kJ/mol) | Temperature (K) | Reference | Comment |
|---|---|---|---|
| 11.34 | 289.9 | Domalski and Hearing, 1996 | AC |
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, custom temperature program
| Column type | Active phase | I | Reference | Comment |
|---|---|---|---|---|
| Capillary | ZB-1 MS | 838. | Bajpai, Al-Reza, et al., 2009 | 30. m/0.25 mm/0.25 μm, Helium; Program: 50 0C 3 0C/min -> 150 0C (10 min) 10 0C/min -> 250 0C |
References
Go To: Top, Condensed phase thermochemistry data, Phase change data, Gas Chromatography, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Meyerhof, 1922
Meyerhof, O.,
Die Verbrennungswarme der Milchsaure,
Biochem. Z., 1922, 129, 594-604. [all data]
Yoshida, 1944
Yoshida, U.,
Structural relaxation of amorphous solids and the cybotactic structure of super-cooled liquids,
Mem. Coll. Sci., Univ. Kyoto, Ser. A, 1944, 24, 135. [all data]
Wilhoit, Chao, et al., 1985
Wilhoit, R.C.; Chao, J.; Hall, K.R.,
Thermodynamic Properties of Key Organic Compounds in the Carbon Range C1 to C4. Part 1. Properties of Condensed Phases,
J. Phys. Chem. Ref. Data, 1985, 14, 1. [all data]
Domalski and Hearing, 1996
Domalski, Eugene S.; Hearing, Elizabeth D.,
Heat Capacities and Entropies of Organic Compounds in the Condensed Phase. Volume III,
J. Phys. Chem. Ref. Data, 1996, 25, 1, 1, https://doi.org/10.1063/1.555985
. [all data]
Bajpai, Al-Reza, et al., 2009
Bajpai, V.K.; Al-Reza, S.M.; Choi, U.L.; Lee, J.H.; Kang, S.C.,
Chemical composition, antibacterial and antioxidant activities of leaf essential oil and extracts of Metasequioa glyptostroboides Miki ex Hu,
Food Chem. Toxicol., 2009, 47, 8, 1876-1883, https://doi.org/10.1016/j.fct.2009.04.043
. [all data]
Notes
Go To: Top, Condensed phase thermochemistry data, Phase change data, Gas Chromatography, References
- Symbols used in this document:
Tfus Fusion (melting) point Ttriple Triple point temperature ΔcH°solid Enthalpy of combustion of solid at standard conditions ΔfusH Enthalpy of fusion - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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