Ammonium acetate
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Names | |
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IUPAC name
Ammonium ethanoate
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Identifiers | |
3D model (JSmol)
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ChEBI | |
ChemSpider | |
ECHA InfoCard | 100.010.149 ![]() |
PubChem CID
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RTECS number |
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UNII | |
CompTox Dashboard (EPA)
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Properties | |
C2H7NO2 | |
Molar mass | 77.083 g·mol−1 |
Appearance | White solid crystals, deliquescent |
Odor | Slightly acetic |
Density | 1.17 g/cm3 (20 °C)[1] 1.073 g/cm3 (25 °C) |
Melting point | 113 °C (235 °F; 386 K) [4] |
102 g/100 mL (0 °C) 148 g/100 mL (4 °C)[1] 143 g/100 mL (20 °C) 533 g/100 mL (80 °C) | |
Solubility | Soluble in alcohol, SO2, acetone, liquid ammonia[2] |
Solubility in methanol | 7.89 g/100 mL (15 °C)[3][1] 131.24 g/100 g (94.2 °C)[2] |
Solubility in dimethylformamide | 0.1 g/100 g[2] |
Acidity (pKa) | 9.9 |
Basicity (pKb) | 33 |
-41.1·10−6 cm3/mol | |
Viscosity | 21 |
Structure | |
Orthorhombic | |
Thermochemistry | |
Std enthalpy of
formation (ΔfH⦵298) |
−615 kJ/mol[2] |
Hazards | |
Main hazards | Irritant |
Safety data sheet | JT Baker |
GHS labelling:[3] | |
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Signal word
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Warning |
H303, H316, H320, H333 | |
P281, P335 | |
NFPA 704 (fire diamond) | ![]()
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Flash point | 136 °C (277 °F; 409 K) [3] |
Lethal dose or concentration (LD, LC): | |
LD50 (median dose)
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386 mg/kg (mice, intravenous)[2] |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
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Infobox references | |
Ammonium acetate, also known as spirit of Mindererus in aqueous solution, is a chemical compound with the formula NH4CH3CO2. It is a white, hygroscopic solid and can be derived from the reaction of ammonia and acetic acid. It is available commercially.[5]
Uses[]
It is the main precursor to acetamide:[6]
- NH4CH3CO2 → CH3C(O)NH2 + H2O
It is also used as a diuretic.[5]
Buffer[]
As the salt of a weak acid and a weak base, ammonium acetate is often used with acetic acid to create a buffer solution. Ammonium acetate is volatile at low pressures. Because of this, it has been used to replace cell buffers that contain non-volatile salts in preparing samples for mass spectrometry.[7] It is also popular as a buffer for mobile phases for HPLC with ELSD detection for this reason. Other volatile salts that have been used for this include ammonium formate.
Other[]
- a biodegradable de-icing agent.
- a catalyst in the Knoevenagel condensation and as a source of ammonia in the Borch reaction in organic synthesis.
- a protein precipitating reagent in dialysis to remove contaminants via diffusion.
- a reagent in agricultural chemistry for determination of soil CEC (cation exchange capacity ) and determination of available potassium in soil wherein the ammonium ion acts as a replacement cation for potassium.
- part of calley's method for lead artifact conservation
Food additive[]
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.[8]
Production[]
Ammonium acetate is produced by the neutralization of acetic acid with ammonium carbonate or by saturating glacial acetic acid with ammonia.[9] Obtaining crystalline ammonium acetate is difficult on account of its hygroscopic nature.
References[]
- ^ a b c Pradyot, Patnaik (2003). Handbook of Inorganic Chemicals. The McGraw-Hill Companies, Inc. ISBN 0-07-049439-8.
- ^ a b c d e http://chemister.ru/Database/properties-en.php?dbid=1&id=354
- ^ a b c d "Safety Data Sheet of Ammonium Acetate" (PDF). tedia.com. Tedia Company Inc. 2011-08-12. Retrieved 2014-06-10.
- ^ Davidson, Arthur W.; McAllister, Walter H. (1930). "Solutions of Salts in Pure Acetic Acid. Ii. Solubilities of Acetates1". Journal of the American Chemical Society. 52 (2): 507–519. doi:10.1021/ja01365a010. ISSN 0002-7863.
- ^ a b Hosea Cheung; Robin S. Tanke; G. Paul Torrence. "Acetic Acid". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a01_045.pub2.
- ^ Coleman, G. H.; Alvarado, A. M. (1923). "Acetamide". Organic Syntheses. 3: 3.; Collective Volume, 1, p. 3
- ^ Berman, Elena S. F.; Fortson, Susan L.; Checchi, Kyle D.; Wu, Ligang; Felton, James S.; Kuang Jen, J. Wu; Kulp, Kristen S. (2008). "Preparation of single cells for imaging/profiling mass spectrometry". J Am Soc Mass Spectrom. 19 (8): 1230–1236. doi:10.1016/j.jasms.2008.05.006. PMID 18565760.
- ^ Australia New Zealand Food Standards Code "Standard 1.2.4 - Labelling of ingredients". Retrieved 2011-10-27.
- ^ Brannt, William (1914). A practical treatise on the manufacture of vinegar. Lancaster, PA: Henry Carey Baird & Co. pp. 316–317.
External links[]
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Wikimedia Commons has media related to Ammonium acetate. |
- Ammonium compounds
- Acetates