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Ammonium acetate

Ammonium acetate
IUPAC name Ammonium acetate
CAS number 631-61-8
Molecular formula CH3COONH4
Molar mass 77.0825 g/mol
Appearance White solid or colorless transparent crystals
Density 1.07 g/cm³, solid
Melting point

112 °C (385 K)

Boiling point


Solubility in water 148 g/100 ml (4 °C)
Crystal structure orthorhombic
Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)

Infobox disclaimer and references

Ammonium acetate is a chemical compound with the formula NH4C2H3O2. It is a white solid, which can be derived from the reaction of ammonia and acetic acid. It is available commercially, and depending on grade, can be rather inexpensive.

Uses and distinctive properties

As the salt of a weak acid and a weak base, ammonium acetate has a number of distinctive properties.

  • NH4C2H3O2 is occasionally employed as a biodegradable de-icing agent.
  • It is often used with acetic acid to create an buffer solution, one that can be thermally decomposed to non-ionic products
  • Ammonium acetate is useful in the Knoevenagel condensation in organic synthesis.
  • It is relatively unusual example of a salt that melts at low temperatures.
  • Can be used with distilled water to make a protein precipitating reagent.


NH4C2H3O2 is hygroscopic. It decomposes easily at elevated temperatures into acetamide.

NH4C2H3O2 → CH3C(O)NH2 + H2O

In this reaction, a salt is converted to two molecular species, which is a relatively uncommon conversion at mild temperatures.


    • G. Jones, Organic Reactions, 1967, volume 15, 204ff (the Knoevenagel Reaction)
    This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Ammonium_acetate". A list of authors is available in Wikipedia.
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