Stearic Acid

A carboxylic acid, C18H36O2, 284.484 g/mol. Boiling point 383 °C, melting point 68.8 °C, as published.

verified recordOrganic — carboxylic acid9 measured properties

Identifiers

Molecular formula: C₁₈H₃₆O₂
Molecular weight: 284.484 g/mol
Exact mass: 284.27153 g/mol
IUPAC name: octadecanoic acid
SMILES: CCCCCCCCCCCCCCCCCC(=O)O
InChI: InChI=1S/C18H36O2/c1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18(19)20/h2-17H2,1H3,(H,19,20)
InChIKey: QIQXTHQIDYTFRH-UHFFFAOYSA-N

Open in ReactionLens Use in reaction prediction

Measured properties

Published measurements, each with its source. Two readings of one property are both shown, in the units each used.

Boiling Point: 721 °F at 760 mmHg (NTP, 1992)measured · CAMEO Chemicals; 383 °Cmeasured · DrugBank
Melting Point: 156.7 °F (NTP, 1992)measured · CAMEO Chemicals; 68.8 °Cmeasured · DrugBank
Density: 0.86 at 68 °F (USCG, 1999) - Less dense than water; will floatmeasured · CAMEO Chemicals; 0.9408 g/cu cm at 20 °Cmeasured · Hazardous Substances Data Bank (HSDB)
Solubility: 1 to 10 mg/mL at 73 °F (NTP, 1992)measured · CAMEO Chemicals; 0.597 mg/L (at 25 °C)measured · DrugBank
Vapor Pressure: 1 mmHg at 344.7 °F ; 5 mmHg at 408.2 °F (NTP, 1992)measured · CAMEO Chemicals; 0.00000004 [mmHg]measured · Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
LogP: 8.23measured · DrugBank; log Kow = 8.23measured · Hazardous Substances Data Bank (HSDB)
Flash Point: 385 °F (NTP, 1992)measured · CAMEO Chemicals; 113 °C (235 °F) - closed cupmeasured · Hazardous Substances Data Bank (HSDB)
Viscosity: 9.87 mPa.sec (cP) at 70 °Cmeasured · Bagby MO et al; Carboxylic acids. Kirk-Othmer Encyclopedia of Chemical Technology. (1999-2017). New York, NY: John Wiley & Sons. Online Posting Date: 17 Oct 2003.
Refractive Index: Index of refraction: 1.4299 at 80 °Cmeasured · Lide, D.R., G.W.A. Milne (eds.). Handbook of Data on Organic Compounds. Volume I. 3rd ed. CRC Press, Inc. Boca Raton ,FL. 1994., p. V4: 3676; Index of refraction: 1.6130 at 20 °Cmeasured · Haynes, W.M. (ed.). CRC Handbook of Chemistry and Physics. 95th Edition. CRC Press LLC, Boca Raton: FL 2014-2015, p. 3-488

Calculated properties

Derived from the structure, not from a sample; kept apart from the measurements above.

Molecular weight: 284.5 g/molcalculated · reference compound database; Average mass of one molecule, from reference compound database.
Exact mass: 284.271530387 Dacalculated · reference compound database; Mass of the most common isotopic form.
XLogP3: 7.4calculated · reference compound database; Estimated oil/water partition, computed by reference compound database.
Polar surface area: 37.3 Å²calculated · reference compound database; Polar surface area as computed by reference compound database.
Complexity: 202calculated · reference compound database; A rough measure of how intricate the structure is.
H-bond donors: 1calculated · reference compound database
H-bond acceptors: 2calculated · reference compound database
logP: 6.3325calculated · chemistry engine; Estimated preference for oil over water. Higher means more oil-like.
Topological polar surface area: 37.3 Å²calculated · chemistry engine; Surface area from polar atoms; relates to how easily a molecule crosses membranes.
H-bond donors: 1calculated · chemistry engine; Atoms that can donate a hydrogen bond.
H-bond acceptors: 1calculated · chemistry engine; Atoms that can accept a hydrogen bond.
Rotatable bonds: 16calculated · chemistry engine; Single bonds the molecule can freely twist around.
Molar refractivity: 87.1818 cm³/molcalculated · chemistry engine; Relates to the molecule's polarisability.
Fraction sp³ carbons: 0.9444calculated · chemistry engine; Share of carbon atoms with tetrahedral bonding.
QED drug-likeness: 0.336calculated · chemistry engine; Quantitative estimate of drug-likeness (0–1).

What it is made of

Elements

C Carbon18 atoms · 76.0% by mass
H Hydrogen36 atoms · 12.8% by mass
O Oxygen2 atoms · 11.2% by mass

Percentages are of the molecular weight above, worked out the same way the molar mass calculator does it.

Structure

Heavy atoms, hydrogen excluded: 20
Total atoms, hydrogen included: 56
Rings: 0
Aromatic rings: 0
Stereocentres: 0
Formal charge: 0

Functional groups

Carboxylic acid
A carbon double-bonded to oxygen and bonded to an –OH group; acidic.

Matched by structural pattern, not by a measurement.

The molecule in three dimensions

Rotate and inspect the atoms. Loaded only when you ask, so the page stays light.

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

No documented reaction with a written procedure and a source involves Stearic Acid yet.

Other names for it

The systematic name on this record is octadecanoic acid.

The sources also call it Octadecanoic acid, n-Octadecanoic acid, Stearophanic acid, Stearex Beads, 1-Heptadecanecarboxylic acid, Pearl stearic, Cetylacetic acid, Industrene R, Octadecansaeure, Stearinsaeure, Vanicol.

Structurally related

Nothing structurally close to Stearic Acid has a page here yet.

Where these values came from

reference compound database5281
compound record
chemistry engine
structure perception

compound record.

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.