Specifications of Ammonium Carbonate USP
Carbonic acid, monoammonium salt, mixture with ammonium carbamate.
Monoammonium carbonate mixture with ammonium carbamate CAS 8000-73-5

Ammonium Carbonate consists of ammonium bicarbonate (NH 4HCO3) and ammonium carbamate (NH2COONH4) in varying proportions. It yields not less than 30.0 percent and not more than 34.0 percent of NH3.

Identification: When heated, it is volatilized without charring, and the vapor is alkaline to moistened litmus paper. A solution (1 in 20) effervesces with acids.
Residue on ignition: not more than 0.1%.
Chloride: Maximum 0.0035%.
Sulfate: A 2.0-g portion shows no more sulfate than corresponds to 0.10 mL of 0.020 N sulfuric acid (0.005%).
Heavy metals: the limit is 0.001%.
Assay: Place in a weighing bottle about 10 mL of water, tare the bottle and its contents, add about 2 g of Ammonium Carbonate, and weigh accurately. Transfer the contents of the bottle to a 250-mL flask, add 50.0 mL of 1 N sulfuric acid VS, and, when solution has been effected, add methyl orange, and titrate the excess acid with 1 N sodium hydroxide. Perform a blank determination. Each mL of 1 N sulfuric acid is equivalent to 17.03 mg of NH3.

Specifications of Ammonium Carbonate FCC Food Grade
INS: 503(i); CAS 10361-29-2

DESCRIPTION
Ammonium Carbonate occurs as a white powder or as hard, white or translucent masses. It consists of ammonium bicarbonate (NH4HCO3) and ammonium carbamate (NH2·COONH4) in varying proportions. On exposure to air it becomes opaque and is finally converted into porous lumps or a white powder of ammonium bicarbonate because of the loss of ammonia and carbon dioxide. One gram dissolves slowly in about 4 mL of water. Its solutions are alkaline to litmus.
Function: Buffer; leavening agent; neutralizing agent.

REQUIREMENTS
Identification: When heated, a sample volatilizes without charring, and the vapor is alkaline to moistened litmus paper. A 1:20 aqueous solution effervesces when an acid is added.
Assay: Not less than 30.0% and not more than 34.0% of NH3.
Chloride: Not more than 0.003%.
Lead: Not more than 3 mg/kg.
Nonvolatile Residue: Not more than 0.05%.
Sulfur Compounds (as SO4): Not more than 0.005%.

REQUIREMENTS
Assay: ≥30.0% NH3

MAXIMUM ALLOWABLE
Insoluble matter: 0.005%
Nonvolatile matter: 0.01%
Chloride (Cl): 5 ppm
Sulfur compounds (as SO4): 0.002%
Heavy metals (as Pb): 5 ppm
Iron (Fe): 5 ppm.