Ammonium Bicarbonate

Title: Ammonium Bicarbonate
CAS Registry Number: 1066-33-7
Additional Names: Acid ammonium carbonate; ammonium hydrogen carbonate
Molecular Formula: CH5NO3
Molecular Weight: 79.06
Percent Composition: C 15.19%, H 6.37%, N 17.72%, O 60.71%
Line Formula: NH4HCO3
Literature References: Occurs in the urine of alligators: Coulson, Hernandez, Proc. Soc. Exp. Biol. Med. 88, 682 (1955). Usually prepd by passing an excess of carbon dioxide through concd ammonia water. Manuf: GB 304872 (1927 to I.G. Farben.); Brooks, GB 742386 (1955 to I.C.I.). See also Ammonium Carbonate.
Properties: Shiny, hard, colorless or white prisms or crystalline mass. Faint odor of ammonia. Comparatively stable at room temp. Volatile with decompn at about 60°. The white fumes given off consist of NH3 21.5%, CO2 55.7%, H2O vapor 22.8%. Rate of decompn increases as temp rises. mp 107.5° (very rapid heating). Soly in water: 14% (10°); 17.4% (20°); 21.3% (30°). Decomposed by hot water. One gram dissolves in 10 ml glycerol (pharmaceutical grade). pH of 0.1N soln in water at 25° = 7.8. Insol in alcohol and acetone. Negative heat of solution.
Melting point: mp 107.5° (very rapid heating)
NOTE: Pharmaceutical Incompat: Acids, caustic alkalies.
Use: In baking powder formulations; in cooling baths (one kg dissolved in 5 liters H2O at 17° lowers it to 7°); in fire extinguishers; manuf porous plastics, ceramics; manuf dyes, pigments; in compost heaps to accelerate decompn; as fertilizer; for defatting textiles; in cold wave solns; in chrome leather tanning; to remove gypsum from heat exchanges and other processing equipment.
Therap-Cat: Expectorant.
Therap-Cat-Vet: Expectorant. Used in bloat, colic.
Keywords: Expectorant.
Ammonium Bifluoride Ammonium Bimalate Ammonium Binoxalate Ammonium Bisulfate Ammonium Bisulfide

Ammonium bicarbonate is an inorganic compound with formula (NH4)HCO3. The compound has many names, reflecting its long history. Chemically speaking, it is the bicarbonate salt of ammonium. It is a colourless solid that degrades readily to carbon dioxide and ammonia.

Ammonium bicarbonate
2D model of ammonium bicarbonate
Ball-and-stick model of the ammonium cation Ball-and-stick model of the bicarbonate anion
CAS number 1066-33-7 YesY
ChemSpider 13395 YesY
UNII 45JP4345C9 YesY
RTECS number BO8600000
Jmol-3D images Image 1
Molecular formula NH4HCO3
Molar mass 79.056 g/mol
Density 1.586 g/cm3
Melting point 41.9 °C, 315 K, decomp.
Solubility in water 11.9 g/100 mL (0 °C)
21.6 g/100 mL (20 °C)
36.6 g/100 mL (40 °C)
Solubility insoluble in methanol
GHS pictograms GHS-pictogram-exclam.svg[1]
GHS hazard statements H302[1]
GHS precautionary statements none[1]
EU Index Not listed
Main hazards Decomposes to release ammonia
NFPA 704
NFPA 704.svg
Flash point Non-flammable
Related compounds
Other anions Ammonium carbonate
Other cations Sodium bicarbonate
Potassium bicarbonate
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Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references