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Sodium trimetaphosphate (also STMP), with formula Na 3 P 3 O 9, is one of the metaphosphates of sodium. It has the formula Na 3 P 3 O 9 but the hexahydrate Na 3 P 3 O 9 ·(H 2 O) 6 is also well known. It is the sodium salt of trimetaphosphoric acid. It is a colourless solid that finds specialised applications in food and construction industries ...
Trimetaphosphate is a cyclic trimer formed by the self reaction of metaphosphate ions. A metaphosphate ion is an oxyanion that has the empirical formula PO − 3. [1] It was first postulated in 1955 [2] but was not observed until 1979, when it was detected by mass spectrometry. [3]
Sodium hexametaphosphate (SHMP) is a salt of composition Na 6 [(PO 3) 6]. [3] Sodium hexametaphosphate of commerce is typically a mixture of metaphosphates (empirical formula: NaPO 3), of which the hexamer is one, and is usually the compound referred to by this name. Such a mixture is more correctly termed sodium polymetaphosphate.
Sodium triphosphate (STP), also sodium tripolyphosphate (STPP), or tripolyphosphate (TPP), [1]) is an inorganic compound with formula Na 5 P 3 O 10. It is the sodium salt of the polyphosphate penta-anion, which is the conjugate base of triphosphoric acid. It is produced on a large scale as a component of many domestic and industrial products ...
The cyclic polyphosphates, called metaphosphates, include the trimer sodium trimetaphosphate and the tetramer, Na 3 P 3 O 9 and Na 4 P 4 O 12, respectively. Polymeric sodium phosphates are formed upon heating mixtures of NaH 2 PO 4 and Na 2 HPO 4, which induces a condensation reaction. The specific polyphosphate generated depends on the details ...
A general formula for such cyclic compounds is [HPO 3] x where x = number of phosphoric units in the molecule. When metaphosphoric acids lose their hydrogens as H +, cyclic anions called metaphosphates are formed. An example of a compound with such an anion is sodium hexametaphosphate (Na 6 P 6 O 18), used as a sequestrant and a food additive.
These species have the formula [NaPO 3] n [NaPO 3 (OH)] 2 where n can be as great as 2000. ... Sodium trimetaphosphate; Sodium hexametaphosphate; References
It is produced by replacing the hydrogen bonds between starch chains by stronger, covalent phosphate bonds that are more permanent. It is manufactured by treating starch with sodium tripolyphosphate (STPP) and sodium trimetaphosphate (STMP), or phosphoryl chloride (POCl3). Phosphorylated cross-linked starches is a category of modified food ...