Citric Acid
A carboxylic acid, C6H8O7, 192.123 g/mol. Boiling point Decomposes, melting point 153 °C, as published.
Identifiers
- Molecular formula
- C₆H₈O₇
- Molecular weight
- 192.123 g/mol
- Exact mass
- 192.027003 g/mol
- IUPAC name
- 2-hydroxypropane-1,2,3-tricarboxylic acid
- O=C(O)CC(O)(CC(=O)O)C(=O)O
- 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)
- KRKNYBCHXYNGOX-UHFFFAOYSA-N
Measured properties
- Boiling Point
- Decomposes (NTP, 1992)
- Decomposes
- Melting Point
- 307 °F (anhydrous) (NTP, 1992)
- 153 °C
- Density
- 1.54 at 68 °F (USCG, 1999) - Denser than water; will sink
- 1.665 g/cu cm at 20 °C
- Solubility
- greater than or equal to 100 mg/mL at 72 °F (NTP, 1992)
- 592000 mg/L (at 20 °C)
- LogP
- -1.64
- log Kow = -1.64
- Flash Point
- 100 °C
- Viscosity
- 2.549 cP 30% aqueous solution at 20 °C
- Refractive Index
- INDEX OF REFRACTION: 1.493, 1.498, 1.509 @ 20 °C /CITRIC ACID HYDRATE/
- Index of refraction (30% solution): 1.3744 at 20 °C/D
Calculated properties
- Molecular weight
- 192.12 g/mol
- Exact mass
- 192.02700259 Da
- XLogP3
- -1.7
- Polar surface area
- 132 Ų
- Complexity
- 227
- H-bond donors
- 4
- H-bond acceptors
- 7
- logP
- -1.2485
- Topological polar surface area
- 132.13 Ų
- H-bond donors
- 4
- H-bond acceptors
- 4
- Rotatable bonds
- 5
- Molar refractivity
- 37.0912 cm³/mol
- Fraction sp³ carbons
- 0.5
- QED drug-likeness
- 0.4274
What it is made of
Elements
Structure
- Heavy atoms, hydrogen excluded
- 13
- Total atoms, hydrogen included
- 21
- Rings
- 0
- Aromatic rings
- 0
- Stereocentres
- 0
- Formal charge
- 0
Functional groups
Carboxylic acid
Alcohol
The molecule in three dimensions
The drawing above is a diagram of what is bonded to what. A molecule is not flat, and the model here is one low-energy shape generated from the connectivity — useful for seeing which groups can reach each other, and not a measured structure. A real sample is a population of conformations, interconverting.
Reactions it appears in
Other names for it
The systematic name on this record is 2-hydroxypropane-1,2,3-tricarboxylic acid.
The sources also call it 2-hydroxypropane-1,2,3-tricarboxylic acid, Citric acid, anhydrous, Aciletten, Anhydrous citric acid, Citro, Citretten, Citric acid anhydrous, Chemfill, Hydrocerol A, 1,2,3-Propanetricarboxylic acid, 2-hydroxy-, 2-hydroxy-1,2,3-propanetricarboxylic acid.
Structurally related
Seen alongside it in reaction records
Molecules that appear in the same recorded reactions as Citric Acid. This says nothing about structure: most of them are the bases, solvents, ligands and catalysts the chemistry needed, and they are here because somebody put them in the same flask.
Where these values came from
chemistry engine
What this page does not claim
Identifiers are copied from the source record, measured values are reported as published, and calculated values are marked as calculated. Nothing here is a hazard, purity or handling assessment — how the library is checked.
Where to next
More molecules under C
The rest of this shelf, a hundred names at a time.
Molar mass calculator
Work with C6H8O7 in a calculation, with every element's contribution shown.
Molarity calculator
Grams of Citric Acid for a volume and a concentration, or the concentration a mass gives.
Open in ReactionLens
The full record in the workstation: every atom, every bond, and the reactions it appears in.