Citric acid

CAS Registry Number®

77-92-9

CAS Name

Citric acid

Molecular Formula

C6H8O7

Molecular Mass

192.12

Cite this Page

Citric acid.   CAS Common Chemistry.   CAS, a division of the American Chemical Society, n.d.   http://commonchemistry.cas.org/detail?cas_rn=77-92-9 (retrieved 2025-07-10) (CAS RN: 77-92-9).  Licensed under the Attribution-Noncommercial 4.0 International License (CC BY-NC 4.0).

Compound Properties

  • Boiling Point (1)

    142-143 °C

  • Melting Point (2)

    153 °C

  • Density (2)

    1.665 g/cm³ @ Temp: 20 °C

Source(s)

Other Names and Identifiers

InChI

InChI=1S/C6H8O7/c7-3(8)1-6(13,5(11)12)2-4(9)10/h13H,1-2H2,(H,7,8)(H,9,10)(H,11,12)

InChIKey

InChIKey=KRKNYBCHXYNGOX-UHFFFAOYSA-N

SMILES

C(CC(O)=O)(CC(O)=O)(C(O)=O)O

Canonical SMILES

O=C(O)CC(O)(C(=O)O)CC(=O)O

Other Names for this Substance

  • 1,2,3-Propanetricarboxylic acid, 2-hydroxy-
  • Citric acid
  • 2-Hydroxy-1,2,3-propanetricarboxylic acid
  • Aciletten
  • Citretten

View All

Deleted or Replaced CAS Registry Numbers

12262-73-6, 43136-35-2, 136108-93-5, 245654-34-6, 623158-96-3, 856568-15-5, 878903-72-1, 890704-54-8, 896506-46-0, 906507-37-7, 1192555-95-5, 2023788-69-2

CAS INSIGHTSTM
Aspergillus fungus, computer illustration. This is a toxic fungus that causes diseases in humans.