Insoluble Sodium Metaphosphate

Chemical Designations - Synonyms Sodium phosphate is generic term and includes the following (1) monosodium phosphate (MSP sodium phospWe, monobasic), (2) disodium phosphate (DSP sodium phosphate dibasic), (3) trisodium phosphate (TSP sodium phosphate, tribasic), (4) sodium acid pyrophosphate (ASPP SAPP disodium pyrophosphate (TSPP), (6) sodium metaphosphate (insoluble sodium metaphosphate), (7) sodium trimetaphosphate, and (9) sodium tripolyphosphate (STPP TPP) Chemical Formula (1) NaHjPO (2) Na HPO (3) NajPO (4) Na H P O, (5) Na P O, (6) (NaPOj) (7) (NaP03)3 (8) (NaP03) NaO (9) Na,P30,o. 

Sodium Metaphosphate, Insoluble, occurs as a white, crystalline powder. It is a high-molecular-weight sodium polyphosphate composed of two long metaphosphate chains (NaP03) that spiral in opposite directions about a common axis. The Na20/P205 ratio is about 1.0. It is practically insoluble in water but dissolves in mineral acids and in solutions of potassium and ammonium (but not sodium) chlorides. The pH of a 1 3 slurry in water is about 6.5. 

Sodium Metaphosphate, Insoluble, 52 Sodium Phosphate, Dibasic, 53 Sodium Phosphate, Monobasic, 54 Sodium Phosphate, Tribasic, 54 Sodium Polyphosphates, Glassy, 55 Sodium Potassium Tripolyphosphate, 56... 

Sodium Phosphate Monosodium Phosphate (Msp, Sodium Phosphate, Monobasic) Disodium Phosphate (Dsp, Sodium Phosphate Dibasic) Trisodium Phosphate (TSP, Sodium phosphate, Tribasic) Sodium Acid Pyrophosphate (ASPP, SAPP, Disodium Pyrophosphate (TSPP) Sodium Metaphosphate (Insoluble Sodium Metaphosphate)... 

Sodium metaphosphate CAS 10361-03-2 EINECS/ELINCS 233-782-9 Synonyms Graham s salt IMP Insoluble metaphosphate Insoluble sodium metaphosphate Kurrol s salt Maddrell s salt Metaphos Metaphosphoric acid, sodium salt Polymeric sodium metaphosphate Poly (sodium metaphosphate) Sodium metaphosphate, insoluble Sodium polyphosphates, glassy Sodium tetrapolyphosphate Empirical O3P Na... 

Sodium metaphosphate, insoluble. See Sodium metaphosphate Sodium metasilicate... 

The monofluorophosphates can be prepared by neutralization of monofluorophosphoric acid (1). Sodium monofluorophosphate [7631 -97-2] is prepared commercially (57) by fusion of sodium fluoride and sodium metaphosphate, and the potassium monofluorophosphate [14104-28-0] can be prepared similarly. Insoluble monofluorophosphates can be readily prepared from reaction of nitrate or chloride solutions with sodium monofluorophosphate. Some salts are prepared by metathetical reactions between silver monofluorophosphate [66904-72-1] and metal chlorides. 

An abrasive is usually chemically inert, neither interacting with other dentifrice ingredients nor dissolving in the paste or the mouth. Substances used as dentifrice abrasives include amorphous hydrated silica, dicalcium phosphate dihydrate [7789-77-7] anhydrous dicalcium phosphate [7757-93-9] insoluble sodium metaphosphate [10361-03-2], calcium pyrophosphate [35405-51-7], a-alumina trihydrate, and calcium carbonate [471-34-1]. These materials are usually synthesized to specifications for purity, particle size, and other characteristics naturally occurring minerals are used infrequently. Sodium bicarbonate [144-55-8] and sodium chloride [7647-14-5] have also been employed as dentifrice abrasives. 

Insoluble Sodium Metaphosphate, 52 Insoluble Sodium Polyphosphate, 52 Isoamyl Alcohol, 78 Isoamyl Benzoate, 78 Isoamyl Butyrate, 78 Isoamyl Phenyl Acetate, 78 Isoamyl Salicylate, 78 Isobutyl Cinnamate, 78 Isobutyl Isovalerate, 84 Isobutyraldehyde, 78 DL-Isoleucine, 30 L-Isoleucine, 31 Isopropyl Acetate, 80... 

Sodium metaphosphate, NaPOs.—The metaphosphate is prepared by the interaction of sodium nitrate and phosphoric acid at 330° C.20 It is a white, vitreous mass, almost insoluble in water, and melting21 at 617 2° C. It is sometimes called Maddrell s salt, after its discoverer.22 The semihydrate, NaP03, H20, is formed by heating sodium ammonium hydrogen phosphate at 160° to 170° C., and subsequently raising the temperature to 320° C.23 Tammann24 has proved the existence... 

Uranyl pyrophosphate, (U03)2P207, is formed as a precipitate when a solution of sodium metaphosphate is poured into a hot solution of uranyl nitrate. The tetrahydrate, (U02)2P20,.4H20, is precipitated in yellow microcrystals by double decomposition of sodium pyrophosjihate and uranyl nitrate. The hydrate loses water and yields the anhydrous salt at 120° C. Uranyl pyrojohosphate is insoluble in water, alcohol, or ether but it dissolves in excess of sodium pyrophosphate solution (see below), and also in dilute nitric acid. 

Maddrell s salts. (IMP). Insoluble sodium metaphosphate, NaP03-II and NaP03-III. 

Properties (1) White, crystalline powder. Slightly hygroscopic. Very soluble in water. Has acid reaction forms sodium acid pyrophosphate at 225-250C and sodium metaphosphate at 350 100C (2) large transparent crystals. Mp loses water at 100C, d 2.040. Very soluble in water insoluble in alcohol pH of 1% solution 4.4 1.5. Nonflammable. 

EINECS 256-779-4 Grahamsches sdz Metaphosphoric acid, sodium salt Natrium polymetaphosphat Sodium metaphosphate Sodium metapolyphosphate Sodium polymetaphosphate Sodium polyphosphate. Water softener and detergent. Solid mp = 628° d n 2.181 soluble in H2O. insoluble in organic solvents LD50 (rat ori) = 6200 mgikg. PMC. 

Inositol niacinate Inositol nicotinate. See Inositol hexanicotinate Insect powder. See Pyrethrum Insect Repellent 3535. See Ethyl butylacetylaminopropionate Insoluble metaphosphate. See Sodium metaphosphate... 

Sodium trimetaphosphate can be prepared by (1) heating sodium dihydrogen orthophosphate for 5 hours at 530° or (2) tempering a glassy sodium metaphosphate at 520° fo 12 hours. If the product obtained by the first of these procedures is not entirely water-soluble, additional heating will be necessary to eliminate the insoluble polymer that forms at a lower temperature. 

Silver monofluophosphate is needed in the purification of crude sodium monofluophosphate. It has been prepared by Lange from the ammonium fluoride-phosphorus (V) oxide fusion residues but, using the same general technique, it is more conveniently made from a sodium metaphosphate-sodium fluoride fusion residue. The impurities in such a mixture are the various phosphates whose silver salts are quite insoluble and may be removed from solution as such silver monofluophosphate is prepared by adding solid silver nitrate to the filtrate. 

Other abrasives include dicalcium phosphate dihydrate (CaHP04 2H2O), which is not stable in toothpaste formulations and converts into CaHP04 which is much harder. Nevertheless, CaHP04 2H2O can be stabilized by addition of tetrasodium pyrophosphate. Insoluble sodium metaphosphate ((NaPOj) ), calcium pyrophosphate (Ca2P207), and sodium bicarbonate may also be encountered in toothpaste formulations. 

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