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) Copy

  
• IUPAC Standard InChIKey: JVTAAEKCZFNVCJ-UHFFFAOYSA-N Copy
• 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:
  • dl-lactic acid
• Stereoisomers:
  • (R)-lactic acid
  • L-Lactic acid
• 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
• Information on this page:
  • Condensed phase thermochemistry data
  • Phase change data
  • Henry's Law data
  • IR Spectrum
  • Mass spectrum (electron ionization)
  • Gas Chromatography
  • References
  • Notes
• Data at other public NIST sites:
  • Gas Phase Kinetics Database
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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

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

Enthalpy of fusion

Henry's Law 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: Rolf Sander

Henry's Law constant (water solution)

k_H(T) = k°_H exp(d(ln(k_H))/d(1/T) ((1/T) - 1/(298.15 K)))
k°_H = Henry's law constant for solubility in water at 298.15 K (mol/(kg*bar))
d(ln(k_H))/d(1/T) = Temperature dependence constant (K)

IR Spectrum

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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

Gas Phase Spectrum

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Additional Data

Mass spectrum (electron ionization)

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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

Spectrum

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Additional Data

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

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References

Go To: Top, Condensed phase thermochemistry data, Phase change data, Henry's Law data, IR Spectrum, Mass spectrum (electron ionization), 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

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• Symbols used in this document:
  

  Tfus	Fusion (melting) point
  Ttriple	Triple point temperature
  d(ln(kH))/d(1/T)	Temperature dependence parameter for Henry's Law constant
  k°H	Henry's Law constant at 298.15K
  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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