Ammonium acetate

CAS Number
631-61-8
EC Number
211-162-9
Abbreviation
CH3COONH4

What is Ammonium acetate?

Ammonium acetate (CAS 631-61-8), also known by its food additive designation E264, is an ammonium salt used in food, pharmaceutical and analytical chemistry.

Where is Ammonium acetate used?

  • Food and beverage: preservative, acidity regulator in baked goods, condiments and meat products
  • Pharmaceuticals: buffered solutions and reagent in API synthesis, particularly reductive amination
  • Personal care: humectant and pH stabilizer in lotions and topical formulations
  • Analytical and biotech laboratories rely on it as a volatile buffer in HPLC mobile phases and LC-MS workflows.

Good to know: Its low residue profile is critical for instrument compatibility.

Commercial specifications

  • Food-grade (FCC, E264-compliant), USP/BP and high-purity analytical grades meeting HPLC and LC-MS specifications

Other Names (Synonyms)

azanium acetate|ammonium ethanoate|acetic acid, ammonium salt|RRE756S6Q2|RefChem:5546|Acetic acid, ammonium salt (1:1)|Mindererus's spirit|CH3COONH4|E264

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What are the physical properties of Ammonium acetate?

Melting Point 114 °C
Boiling Point 138.46°C (rough estimate)
Density 1.17 g/cm³ @ Temp: 20 °C
Flash Point 136 °C
Appearance Ammonium acetate is a white crystalline solid. Acetic odor.
Color White
Odor Slight acetic acid odor
Form Solid
Water Solubility 1480 g/L (20 ºC)
Vapor Pressure 0.017-0.02Pa at 25℃
Refractive Index 1.4350 (estimate)
pH 6.7-7.3 (50g/l, H2O, 25℃)
Log P -2.79

Which trade and regulatory codes apply to Ammonium acetate?

HS Code 29152900
UN Number 9079
Storage Class 11 - Combustible Solids
WGK (Germany) 3
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