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:
  • Phase change data
  • Henry's Law data
  • Gas Chromatography
  • References
  • Notes
• Other data available:
  • Condensed phase thermochemistry data
  • IR Spectrum
  • Mass spectrum (electron ionization)
• Data at other public NIST sites:
  • Gas Phase Kinetics Database
• Options:
  • Switch to SI units

Data at NIST subscription sites:

• NIST / TRC Web Thermo Tables, professional edition (thermophysical and thermochemical data)

NIST subscription sites provide data under the NIST Standard Reference Data Program, but require an annual fee to access. The purpose of the fee is to recover costs associated with the development of data collections included in such sites. Your institution may already be a subscriber. Follow the links above to find out more about the data in these sites and their terms of usage.

Phase change data

Go To: Top, Henry's Law data, Gas Chromatography, 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:
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

Go To: Top, Phase change data, Gas Chromatography, References, Notes

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)

Gas Chromatography

Go To: Top, Phase change data, Henry's Law data, References, Notes

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

View large format table.

References

Go To: Top, Phase change data, Henry's Law data, Gas Chromatography, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

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, Phase change data, Henry's Law data, Gas Chromatography, References

• 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
  ΔfusH	Enthalpy of fusion

• Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
• The National Institute of Standards and Technology (NIST) uses its best efforts to deliver a high quality copy of the Database and to verify that the data contained therein have been selected on the basis of sound scientific judgment. However, NIST makes no warranties to that effect, and NIST shall not be liable for any damage that may result from errors or omissions in the Database.
• Customer support for NIST Standard Reference Data products.