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Formaldehyde

Organic compound (H–CHO); simplest aldehydeBall and stick model of formaldehydeNames Preferred IUPAC nameFormaldehydeSystematic IUPAC nameMethanalOther names Methyl aldehydeMethylene glycol (diol forms in aqueous solution)Methylene oxideFormalin (aqueous solution)FormolCarbonyl hydrideMethanoneOxomethaneFormic aldehydeIdentifiers CAS Number50-00-03D model (JSmol)Interactive imageBeilstein Reference1209228 ChEBICHEBI:16842ChEMBLChEMBL1255ChemSpider692DrugBankDB03843ECHA InfoCard100.000.002EC Number200-001-8E numberE240 (preservatives)Gmelin Reference445 IUPHAR/BPS4196KEGGD00017MeSHFormaldehydePubChemCID712RTECS numberLP8925000UNII1HG84L3525UN number2209 CompTox Dashboard(EPA)DTXSID7020637InChIInChI=1S/CH2O/c1-2/h1H2Key: WSFSSNUMVMOOMR-UHFFFAOYSA-NInChI=1/CH2O/c1-2/h1H2Key: WSFSSNUMVMOOMR-UHFFFAOYATSMILESC=OProperties Chemical formulaCH2OMolar mass30.026 g·mol Appearance Colorless gas Density0.8153 g/cm (−20 °C) (liquid) Melting point−92 °C (−134 °F; 181 K) Boiling point−19 °C (−2 °F; 254 K) Solubility in water400 g/L log P0.350 Vapor pressure> 1 atm Acidity (pKa) 13.27 (hydrate) Magnetic susceptibility (χ)−18.6·10 cm/mol Dipole moment2.330 D Structure Point groupC2vMolecular shapeTrigonal planar Thermochemistry Heat capacity(C)35.387 J·mol·K Std molarentropy(S298)218.760 J·mol·K Std enthalpy offormation(ΔfH298)−108.700 kJ·mol Gibbs free energy(ΔfG)−102.667 kJ·mol Std enthalpy ofcombustion(ΔcH298)571 kJ·mol Pharmacology ATCvet codeQP53AX19 (WHO) Hazards GHS labelling: PictogramsSignal wordDangerHazard statementsH301+H311+H331, H314, H317, H335, H341, H350, H370Precautionary statementsP201, P280, P303+P361+P353, P304+P340+P310, P305+P351+P338, P308+P310NFPA 704 (fire diamond) 440CORFlash point64 °C (147 °F; 337 K) Autoignitiontemperature430 °C (806 °F; 703 K) Explosive limits7–73% Lethal dose or concentration (LD, LC): LD50 (median dose)100 mg/kg (oral, rat) LC50 (median concentration)333 ppm (mouse, 2 h)815 ppm (rat, 30 min) LCLo (lowest published)333 ppm (cat, 2 h) NIOSH (US health exposure limits): PEL (Permissible)TWA 0.75 ppm ST 2 ppm (as formaldehyde and formalin) REL (Recommended)Ca TWA 0.016 ppm C 0.1 ppm [15-minute] IDLH (Immediate danger)Ca [20 ppm] Safety data sheet (SDS) MSDS(Archived) Related compounds Related aldehydesAcetaldehydeRelated compoundsMethanolFormic acidMethylene imineThioformaldehydeExcept where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).Y verify ( ?)

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