| 词条 | Sodium trimetaphosphate |
| 释义 |
| Verifiedfields = changed | Watchedfields = changed | verifiedrevid = 451978784 | ImageFile = Sodium trimetaphosphate.png | ImageSize = 180px | Reference = [1] | IUPACName = | OtherNames = Sodium trimetaphosphate |Section1={{Chembox Identifiers | CASNo_Ref = {{cascite|correct|??}} | CASNo = 7785-84-4 | PubChem = 24579 | EINECS = 232-088-3 | InChI = 1S/3Na.H3O9P3/c;;;1-10(2)7-11(3,4)9-12(5,6)8-10/h;;;(H,1,2)(H,3,4)(H,5,6)/q3*+1;/p-3 | SMILES = O=P(OP(O1)([O-])=O)([O-])OP1([O-])=O.[Na+].[Na+].[Na+]}} |Section2={{Chembox Properties | Formula = Na3P3O9 | MolarMass = 305.885 g/mol | Appearance = colorless or white crystals | Density = 2.49 g/cm3 (anhydrous) 1.786 g/cm3 (hexahydrate) | MeltingPtC = 53 | MeltingPt_notes = (hexahydrate, decomposes to anyhdrous) | BoilingPt = | Solubility = 22 g/100 mL | SolubleOther = insoluble in alcohol | RefractIndex = 1.433 (hexahydrate) }} |Section3={{Chembox Structure | CrystalStruct = triclinic (hexahydrate) }} |Section5={{Chembox Hazards | MainHazards = | FlashPt = | AutoignitionPt = |Section6={{Chembox Thermochemistry | DeltaHf = | DeltaHc = | Entropy = | HeatCapacity = }} Sodium trimetaphosphate (also STMP), with formula Na3P3O9, is a metaphosphate of sodium. It has the empirical formula NaPO3. It is the sodium salt of trimetaphosphoric acid. It is a colourless solid that finds specialised applications in food and construction industries. STMP is prepared by heating sodium polyphosphate at a few hundred degrees. [2]Although drawn with a particular resonance structure, the trianion has D3d symmetry. References1. ^{{cite book | last = Lide | first = David R. | year = 1998 | title = Handbook of Chemistry and Physics | edition = 87 | volume = | location = Boca Raton, Florida | publisher = CRC Press | isbn = 0-8493-0594-2 | pages = 4–86}} {{DEFAULTSORT:Sodium Trimetaphosphate}}{{inorganic-compound-stub}}2. ^{{cite book|author1=Klaus Schrödter|author2=Gerhard Bettermann|author3=Thomas Staffel|author4=Friedrich Wahl|author5=Thomas Klein|author6=Thomas Hofmann|title=Phosphoric Acid and Phosphates|series=Ullmann’s Encyclopedia of Industrial Chemistry|year=2008|publisher=Wiley-VCH|place=Weinheim|doi=10.1002/14356007.a19_465.pub3}} 3 : Food additives|Sodium compounds|Phosphates |
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