Ammonium acetate | |
---|---|
Ammonium ethanoate |
|
Identifiers | |
CAS number | 631-61-8 |
ChemSpider | 11925 |
UNII | RRE756S6Q2 |
RTECS number | AF3675000 |
Jmol-3D images | Image 1 |
|
|
|
|
Properties | |
Molecular formula | C2H3O2NH4 |
Molar mass | 77.0825 g/mol |
Appearance | white solid crystals deliquescent |
Density | 1.17 g/cm3[1] |
Melting point |
114 °C, 387 K, 237 °F |
Boiling point |
decomposes |
Solubility in water | 148 g/100 ml (4 °C) |
Solubility in methanol | 7.89 g/100 mL (15 °C) |
Structure | |
Crystal structure | orthorhombic |
Hazards | |
MSDS | JT Baker |
GHS pictograms | [2] |
GHS hazard statements | H315, H319, H335[2] |
GHS precautionary statements | P261, P305+351+338[2] |
NFPA 704 |
1
2
1
|
(verify) (what is: / ?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) |
|
Infobox references |
Ammonium acetate is a chemical compound with the formula CH3COONH4 (or C2H4O2.NH3 or C2H7NO2). 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.
Contents |
As the salt of a weak acid and a weak base, ammonium acetate has a number of distinctive properties.
Ammonium acetate is volatile at low pressures. Because of this it has been used to replace cell buffers with non-volatile salts, in preparing samples for mass spectrometry. [3] It is also popular as a buffer for mobile phases for HPLC with ELSD detection for this reason. Other volatile salts which have been used for this include ammonium formate.
Ammonium acetate is also used as a food additive as an acidity regulator; INS number 264. It is approved for usage in Australia and New Zealand.[4]
CH3COONH4 is hygroscopic. It decomposes easily at elevated temperatures into acetamide.
In this reaction, a salt is converted to two molecular species, which is a relatively uncommon conversion at mild temperatures.