Nitrilotrimetaphosphoric acid

According to A. Mente, if in the preparation of imidodiphosphoric acid, the products be heated to 290° or 300°, ammonia iB evolved, and a white flocculent powder is formed from which ammonium chloride can be removed by washing with water. The pale yellow residue dissolves in aq. ammonia and when the soln. is acidified with nitric or hydrochloric acid, a white precipitate is formed, and the soln. contains what is thought to be nitrilotrimetaphosphoric acid,... 

Nitrilotrimetaphosphoric acid is said to be formed by heating crude imidodiphosphoric acid to 290°-300° C., washing out ammonium chloride, dissolving the residue in ammonia, acidifying and filtering off the white precipitate. The solution contained this acid,... 

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See also in sourсe #XX -- [ ]

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