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Chemicals: Acetaldehyde Disclaimer Acetaldehyde Name: Acetaldehyde Synonym(s): Acetic Anhydride Ethanal Ethyl aldehyde Formula: CH3CHO CAS Number: 75-07-0 Formula Weight: 44.1 Vapor Pressure: 740 mm Hg Boiling Point: 69°F Freezing Point: -190°F Solubility: Miscible Ionization Potential: 10.22 eV Specific Gravity: 0.79 Notes: Flammable colorless liquid (or gas above 69°F) with a pungent, fruity odor Excerpted from NIOSH Pocket Guide to Chemical Hazards, US GPO 1997 J551-571