Acetic acid chemical formula CH3COOH pure anhydrous acetic acid

Short Description:

Acetic Acid

Acetic acid, chemical formula CH3COOH, is an organic monobasic acid, the main component of vinegar.Pure anhydrous acetic acid (glacial acetic acid) is a colorless hygroscopic liquid.Freezing point is 16.6°C (62°F).After solidification, it is a colorless crystal and its aqueous solution is weakly acidic and highly corrosive.It is strongly corrosive to metals and the steam is irritating to the eyes and nose.

Acetic acid is widely distributed in nature, such as in fruit or vegetable oils.Acetic acid exists mainly in the form of esters.In animal tissues, excrement and blood, acetic acid exists in the form of free acid.Many microorganisms can convert different organic matter into acetic acid through fermentation.

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Product Detail

Product Tags

Chemical formula: CH3COOH

Appearance: Colorless transparent liquid with pungent odor

Particular weight: 60.05

CAS: 64-19-7

EINECS: 231-791-2

Melting point: 16.6 ℃

Boiling point: 117.9 ℃

Water soluble: Dissolved in water

Density: 1.05 g/cm³

Flash point: 39 ℃

UN No.: 2790

Physical properties:

Boiling point: 117.9℃

Freezing point: 16.6℃

Relative density (water=1): 1.050

Chemical properties

Acidity of acetic acid

The carboxyl hydrogen atoms of acetic acid can be partially ionized into hydrogen ions (protons) and released,acidity leading to carboxylic acid.Acetic acid is a weak monobasic acid in aqueous solution with an acidity coefficient of 4.8.pKa=4.75（25℃）.A solution of acetic acid with a concentration of 1 mol/L (similar to the concentration of household vinegar) has a pH of 2.4.That is to say, only 0.4% of the acetic acid molecules are dissociated.

The following is the national standard of the People’s Republic of China on industrial acetic acid:

Item	Specific
Grade	Premium	First grade	Qualified
Chroma,Hazen Units (Platinum-Cobalt) ≤	10	20	30
Acetic acid content % ≥	99.8	99.0	98.0
Moisture % ≤	0.15	-	-
Formic acid content % ≤	0.06	0.15	0.35
Acetaldehyde content % ≤	0.05	0.05	0.10
Evaporation residue % ≤	0.01	0.02	0.03
Iron content (as Fe)% ≤	0.00004	0.0002	0.0004
Reduction of potassium permanganate substances min ≥	30	5	-

Application

Industry application

Acetic acid is a bulk chemical product and one of the most important organic acids.Mainly used in the production of acetic anhydride, acetate and cellulose acetate, etc.Polyvinyl acetate can be made into films and adhesives and is also a raw material for synthetic fiber vinylon.Cellulose acetate can be used to make rayon and motion picture film.
Acetates formed from lower alcohols are excellent solvents and are widely used in the paint industry.Since acetic acid dissolves most organics, it is also a commonly used organic solvent (eg for the oxidation of p-xylene to produce terephthalic acid).

Storage management

Store in a cool, ventilated warehouse. Keep away from fire and heat sources. In the freezing season, the storage temperature should be kept higher than 16 ℃ to prevent solidification.Keep container tightly closed. It should be stored separately from oxidants and alkalis, and should not be mixed.Use explosion-proof lighting and ventilation facilities. Prohibit the use of mechanical equipment and tools that are prone to sparks. Storage areas should be equipped with emergency release equipment and suitable containment materials.