Explore relationships

Acetaldehyde

Names Preferred IUPAC nameAcetaldehydeSystematic IUPAC nameEthanalOther names Acetic aldehydeEthyl aldehydeAcetylaldehydeIdentifiers CAS Number75-07-03D model (JSmol)Interactive imageInteractive imageAbbreviations AcH ChEBICHEBI:15343ChEMBLChEMBL170365ChemSpider172ECHA InfoCard100.000.761EC Number200-836-8IUPHAR/BPS6277KEGGC00084PubChemCID177RTECS numberAB1925000UNIIGO1N1ZPR3BCompTox Dashboard(EPA)DTXSID5039224InChIInChI=1S/C2H4O/c1-2-3/h2H,1H3Key: IKHGUXGNUITLKF-UHFFFAOYSA-NInChI=1/C2H4O/c1-2-3/h2H,1H3Key: IKHGUXGNUITLKF-UHFFFAOYABSMILESO=CCCC=OProperties Chemical formulaC2H4OMolar mass44.053 g·mol Appearance Colourless gas or liquid OdorEthereal Density0.784 g·cm (20 °C) 0.7904–0.7928 g·cm (10 °C) Melting point−123.37 °C (−190.07 °F; 149.78 K) Boiling point20.2 °C (68.4 °F; 293.3 K) Critical point (T, P) 466 K (193 °C), 5570 kPa Solubility in watermiscible Solubilitymiscible with ethanol, ether, benzene, toluene, xylene, turpentine, acetone slightly soluble in chloroformlog P−0.34 Vapor pressure740 mmHg (20 °C) Acidity (pKa) 13.57 (25 °C, H2O) Magnetic susceptibility (χ)−0.5153 cm/g Refractive index (nD)1.3316 Viscosity0.21 mPa-s at 20 °C (0.253 mPa-s at 9.5 °C) Structure Molecular shapetrigonal planar (sp) at C1tetrahedral (sp) at C2Dipole moment2.7 DThermochemistry Heat capacity(C)89 J·mol·K Std molarentropy(S298)160.2 J·mol·K Std enthalpy offormation(ΔfH298)−192.2 kJ·mol Gibbs free energy(ΔfG)−127.6 kJ·mol Std enthalpy ofcombustion(ΔcH298)−1167 kJ·mol Enthalpy of fusion(ΔfHfus)−2.310 kJ·mol Enthalpy of vaporization(ΔfHvap)26.12 kJ·mol Related compounds Related aldehydesFormaldehydePropionaldehydeRelated compoundsEthylene oxideHazards Occupational safety and health (OHS/OSH): Main hazardssuspected carcinogen GHS labelling: PictogramsHazard statementsH224, H319, H335, H351Precautionary statementsP210, P261, P281, P305+P351+P338NFPA 704 (fire diamond) 343Flash point−39.00 °C; −38.20 °F; 234.15 K Autoignitiontemperature175.00 °C; 347.00 °F; 448.15 K Explosive limits4.0–60% Lethal dose or concentration (LD, LC): LD50 (median dose)1930 mg/kg (rat, oral) LC50 (median concentration)13,000 ppm (rat), 17,000 ppm (hamster), 20,000 ppm (rat) NIOSH (US health exposure limits): PEL (Permissible)200 ppm (360 mg/m) IDLH (Immediate danger)2000 ppm Safety data sheet (SDS) HMDBSupplementary data page Acetaldehyde (data page)Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).Yverify ( ?)

Use + to expand a branch. Click a topic name to open its summary.