Carbonic acid, mono-ammonium salt

Ammonium phosphates will act as fire retardants when wood or fabrics are impregnated with them. On heating they evolve ammonia and phosphoric acid. The former retards combustion of the materials and the latter catalyses the charring of cellulose to carbon. The mono ammonium salt can be used in granular form in some types of fire extinguishers. 

ACID AMMONIUM CARBONATE or ACID AMMONIUM CARBONATE, MONO AMMONIUM SALT (1066-33-7) CHjOj HjN NH4HCO3 Noncomustible solid (Fire Rating 1). Violent reaction with strong acids, forming carbon dioxide. Reacts with strong bases, forming ammonia. In temperatures above 140°F/49°C, ammonia and carbon dioxide fumes are formed. Reacts with fluorine, magnesium, sodium hypochlorite. 

Ammonium metaphosphates.—The product obtained by H. N. Stokes6 by boiling monamidophosphoric acid, NHa.PO(OH)2, is either ammonium mono-metaphosphate, or a mixture of different metaphosphates—vide infra. G. Tam-mann prepared microscopic crystals of what he called ammonium /3-monometa-phosphate, NH4P08, by crystallization in the cold of a soln. of phosphorus pentoxide and glassy metaphosphoric acid with ammonium carbonate. A soln. of the purified salt gives a white precipitate with silver nitrate. The air-dried salt has the composition NH4P03.3,4H2O and it passes in a few weeks into the orthophosphate. 

The preferred alkaline compounds for carrying out my invention are the alkali metal and alkaline earth metal oxides, hydroxides and carbonates, and these compounds are utilized in just sufficient amount to displace the desired amine or amines. It is obvious, of course, that if the mixture of amine salts also contains free mineral acid or an ammonium salt, an additional amoimt of alkali stoichiometrically equivalent to these substances must be added. I have also found that as alkaline reagents for accomplishing this separation it is possible to use other alkylamines or methylamines of different basicity. These amines may be used for displacement together with or in place of the alkalies above mentioned. For example, dimethylamine being more basic than trim-ethylamine may be utilized to displace triethylamine from its hydrohalide salts, when utilized in stoichiometrical proportions. Similarly, diethylamine may be utilized to displace mono and triethylamine from their hydrohalide combinations. 

If a mixture of elemental arsenic and sulfur is heated, the sulfur melts and arsenic trisulfide is formed. In contrast to all other sulfides, this sulfide is soluble in ammonia or ammonium carbonate 5delding ammonium salts of mono- and disulfoarsenious acid ... 

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