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Chemicals: Acetic Acid Disclaimer Acetic Acid Name: Acetic Acid Synonym(s): Ethanoic acid Methanecarboxylic acid Formula: CH3COOH CAS Number: 64-19-7 Formula Weight: 60.1 Vapor Pressure: 11 mm Hg Boiling Point: 244°F Freezing Point: 62°F Solubility: Miscible Ionization Potential: 10.66 eV Specific Gravity: 1.05 Notes: Combustible colorless liquid or crystals with a sour, vinegar-like odor. Vinegar sold in stores may contain as much as 8 percent acetic acid. Excerpted from NIOSH Pocket Guide to Chemical Hazards, US GPO 1997 J551-571