10361-03-2

Basic information

• Product Name: Sodium metaphosphate
• Synonyms: kurrol’ssalt;maddrell’ssalt;maddrellsalt;metafos;metaphosphoricacid(hpo3),sodiumsalt;metaphosphoricacid[hpo3],sodiumsalt;metaphosphoricacid[hpo3],sodiumsalt,homopolymer;poly(sodiummetaphosphate)
• CAS NO: 10361-03-2
• Molecular Formula: NaO₃P
• Molecular Weight: 101.96
• EINECS: 233-782-9
• Product Categories: INORGANIC & ORGANIC CHEMICALS;Inorganics
• Mol File: 10361-03-2.mol
• Article Data: 3

Chemical Properties

• Melting Point: 600 °C
• Appearance: /
• Density: 2.181
• Storage Temp.: Store at +5°C to +30°C.
• Solubility: 1000g/l
• CAS DataBase Reference: Sodium metaphosphate(CAS DataBase Reference)
• NIST Chemistry Reference: Sodium metaphosphate(10361-03-2)
• EPA Substance Registry System: Sodium metaphosphate(10361-03-2)

Safety Data

• WGK Germany: 1
• RTECS: OY3750000
• Hazardous Substances Data: 10361-03-2(Hazardous Substances Data)

Usage

Uses

Different sources of media describe the Uses of 10361-03-2 differently. You can refer to the following data:
1. In dentifrices, polishing agents, abrasive detergents.
2. sodium metaphosphate can be used to adjust pH levels, thus acting as a buffer.

Definition

The value of n ranges from 3 to 10 (cyclic molecules) or may be a much larger number (polymers). Cyclic sodium metaphosphate, based on rings of alter- nating phosphorus and oxygen atoms, range from the trimetaphosphate (Na PO 3 ) 3 to at least the decametaphosphate. So-called sodium hexam- etaphosphate is probably a polymer where n is between 10 and 20 (“Calgon”).

Safety Profile

Moderately toxic by intraperitoneal route. When heated to decomposition it emits toxic fumes of NazO and POx. See also PHOSPHATES.

InChI:InChI=1/Na.HO3P/c;1-4(2)3/h;(H,1,2,3)/q+1;/p-1

Synthetic route

silver(I) bromide + sodium phosphite → sodium hypophosphate (10361-03-2) + silver (7440-22-4)

Conditions	Yield
byproducts: NaBr, H2; heating AgBr in excess to 380°C in a sealed glass tube;

3Na(1+)*NH4(1+)*P4O12(4-)*10H2O=Na3NH4P4O12*10H2O → sodium hypophosphate (10361-03-2) + ammonia (7664-41-7)

Conditions	Yield
In neat (no solvent) heating for a long period;
In neat (no solvent) heating for a long period;

Na(1+)*3NH4(1+)*P4O12(4-)*12H2O=Na(NH4)3P4O12*12H2O → sodium hypophosphate (10361-03-2) + ammonia (7664-41-7)

Conditions	Yield
In neat (no solvent) prolonged heating;
In neat (no solvent) prolonged heating;

4Na(1+)*P4O12(4-)*NaOH=Na4P4O12*NaOH → sodium hypophosphate (10361-03-2)

Conditions	Yield
In neat (no solvent) Kinetics; placed in a platinum crucible in a furnace, temp. range 300-375°C;

4Na(1+)*P4O12(4-)*H3PO4=Na4P4O12*H3PO4 → sodium hypophosphate (10361-03-2)

Conditions	Yield
In neat (no solvent) Kinetics; placed in a platinum crucible in a furnace, temp. range 300-375°C;

sodium cyclotetrapolyphosphate tetrahydrate → sodium hypophosphate (10361-03-2)

Conditions	Yield
In neat (no solvent) Kinetics; placed in a platinum crucible in a furnace, temp. range 300-375°C;

sodium dihydrogenphosphate (10049-21-5) → sodium hypophosphate (10361-03-2)

Conditions	Yield
In neat (no solvent) repeated fusion of NaH2PO4 and cooling the latter up to 500°C in the course of 2 d, removing of residual water;

sodium dihydrogen phosphate monohydrate (10049-21-5) → sodium hypophosphate (10361-03-2)

Conditions	Yield
byproducts: H2O; heating (300°C, 0.5 h and 500°C, 2 h);

Sodium trimetaphosphate + pyrographite (7440-44-0) → sodium hypophosphate (10361-03-2) + phosphorous (12185-10-3)

Conditions	Yield
In neat (no solvent) Kinetics; byproducts: CO; Ar atmosphere; Na3P3O9 placed on graphite boat in electric furnace at 1000 or1100°C; gas phase condensed in receivers; elem., IR and X-ray diffraction anal.;

sodium tetrametaphosphate → sodium hypophosphate (10361-03-2)

Conditions	Yield
In neat (no solvent) Kinetics; placed in a platinum crucible in a furnace, temp. range 300-375°C;

sodium selenide + meta-phosphoric acid (10343-62-1) → sodium hypophosphate (10361-03-2) + hydrogen [75Se]selenide (32819-55-9)

Conditions	Yield
In neat (no solvent) Slow heating to boiling in an evacuated app.; the hydrogen selenide is collected in a liq. N2 trap;

bis-hexaaquasodium bis-[nitrilotris(methylenephosphonato)decaaquamonohydro-hexasodiumlanthanate]trihydrate → sodium hypophosphate (10361-03-2) + lanthanum orthophosphate + lanthanum monohydrodiphosphate + lanthanum trimetaphosphate

Conditions	Yield
In neat (no solvent, solid phase) at 30 - 500℃; Inert atmosphere;

sodium dihydrogen phosphate monohydrate (10049-21-5) + zirconyl chloride octahydrate → sodium hypophosphate (10361-03-2) + zirconium(IV) pyrophosphate + sodium dizirconium triphosphate

Conditions	Yield
Stage #1: sodium dihydrogen phosphate monohydrate; zirconyl chloride octahydrate With sodium fluoride at 120℃; for 24h; Stage #2: at 500℃; for 5h; Calcination;

iron(III) oxide + sodium hypophosphate (10361-03-2) → 9Na(1+)*2Fe(3+)*3P3O10(5-)=Na9Fe2(P3O10)3

Conditions	Yield
In neat (no solvent) reaction at 900°C;

sodium hypophosphate (10361-03-2) + sodium perchlorate → sodium oxide

Conditions	Yield
byproducts: O2, Cl2; in presence of 25-75 mol% NaPO3, in text Na2O*P2O5 as intermediate also mentioned;
byproducts: O2, Cl2; in presence of 25-75 mol% NaPO3, in text Na2O*P2O5 as intermediate also mentioned;

dihydrogen hexachloroplatinate + sodium hypophosphate (10361-03-2) → platinum (7440-06-4)

Conditions	Yield
In water further products: platinum(II) compds.;	0%
In water further products: platinum(II) compds.;	0%

sodium hypophosphate (10361-03-2) → phosphorus

Conditions	Yield
In melt Electrolysis; P formed at Ni cathode in molten NaPO3;

sodium hypophosphate (10361-03-2) + barium(II) chloride → barium metaphosphate

Conditions	Yield
In not given excess of BaCl2; pptn.;
In not given excess of BaCl2; pptn.;

sodium hypophosphate (10361-03-2) + barium(II) oxide → barium phosphate

Conditions	Yield
In melt light red heat, then slow cooling; washing with water;
In melt light red heat, then slow cooling; washing with water;

sodium hypophosphate (10361-03-2) + barium(II) oxide → barium phosphate + barium pyrophosphate

Conditions	Yield
In melt dark red heat, then slow cooling; washing with water;
In melt dark red heat, then slow cooling; washing with water;

sodium hypophosphate (10361-03-2) + barium(II) oxide → barium pyrophosphate

Conditions	Yield
In melt slow cooling; extn. with water;

sodium hypophosphate (10361-03-2) + lead(II) oxide → 2Na(1+)*Pb(2+)*P2O7(4-)=Na2PbP2O7

Conditions	Yield
In melt
In melt

sodium hypophosphate (10361-03-2) + cerium metaphosphate → Na(1+)*Ce(3+)*4PO3(1-) = NaCe(PO3)4

Conditions	Yield
sintering (750°C, 20 h);

sodium hypophosphate (10361-03-2) + sodium bromate → sodium pyrophosphate (124-43-6) + bromine (7726-95-6)

Conditions	Yield
over at 320°C.;
over at 320°C.;

sodium hypophosphate (10361-03-2) + sodium chlorate → chlorine (7782-50-5)

Conditions	Yield
reduction with NaPO3, above 260°C;

sodium hypophosphate (10361-03-2) + ammonium dihydrogen phosphate (7722-76-1) + lithium carbonate (554-13-2) → sodium metaphposphate

Conditions	Yield
In neat (no solvent) byproducts: CO2, NH3; calcination (220 and 550°C), melting, O2 bubled through melt (900°C, 1 h), annealing; DSC, viscosity measurement;

sodium hypophosphate (10361-03-2) + ammonium dihydrogen phosphate (7722-76-1) + lithium carbonate (554-13-2) → ((Na2O)0.5(Li2O)0.5)0.5(P2O5)0.5

Conditions	Yield
In neat (no solvent) byproducts: CO2, NH3; calcination (220 and 550°C), melting, O2 bubled through melt (900°C, 1 h), annealing; DSC, viscosity measurement;

sodium hypophosphate (10361-03-2) + ammonium dihydrogen phosphate (7722-76-1) + lithium carbonate (554-13-2) → ((Na2O)0.6(Li2O)0.4)0.5(P2O5)0.5

Conditions	Yield
In neat (no solvent) byproducts: CO2, NH3; calcination (220 and 550°C), melting, O2 bubled through melt (900°C, 1 h), annealing; DSC;

sodium hypophosphate (10361-03-2) + ammonium dihydrogen phosphate (7722-76-1) + lithium carbonate (554-13-2) → ((Na2O)0.4(Li2O)0.6)0.5(P2O5)0.5

Conditions	Yield
In neat (no solvent) byproducts: CO2, NH3; calcination (220 and 550°C), melting, O2 bubled through melt (900°C, 1 h), annealing; DSC, viscosity measurement;

sodium hypophosphate (10361-03-2) + ammonium dihydrogen phosphate (7722-76-1) + lithium carbonate (554-13-2) → ((Na2O)0.2(Li2O)0.8)0.5(P2O5)0.5

Conditions	Yield
In neat (no solvent) byproducts: CO2, NH3; calcination (220 and 550°C), melting, O2 bubled through melt (900°C, 1 h), annealing; DSC, viscosity measurement;

sodium hypophosphate (10361-03-2) + ammonium dihydrogen phosphate (7722-76-1) + lithium carbonate (554-13-2) → ((Na2O)0.8(Li2O)0.2)0.5(P2O5)0.5

Conditions	Yield
In neat (no solvent) byproducts: CO2, NH3; calcination (220 and 550°C), melting, O2 bubled through melt (900°C, 1 h), annealing; DSC, viscosity measurement;

sodium hypophosphate (10361-03-2) + ammonium dihydrogen phosphate (7722-76-1) + lithium carbonate (554-13-2) → lithium metaphosphate

Conditions	Yield
In neat (no solvent) byproducts: CO2, NH3; calcination (220 and 550°C), melting, O2 bubled through melt (900°C, 1 h), annealing; DSC, viscosity measurement;

sodium hypophosphate (10361-03-2) + ammonium sulfide (12135-76-1) → Dekametaphosphat

Conditions	Yield
In water pptd. with alc.;
In water pptd. with alc.;

sodium hypophosphate (10361-03-2) + platinum(IV) chloride (13454-96-1) → platinum (7440-06-4)

Conditions	Yield
In water	0%
In water	0%

Upstream product

• 10049-21-5 sodium dihydrogenphosphate 
• 10049-21-5 sodium dihydrogen phosphate monohydrate 
• 10343-62-1 meta-phosphoric acid 
• 7440-44-0 pyrographite 

Downstream Products

• 7440-06-4 platinum 
• 124-43-6 sodium pyrophosphate 
• 7726-95-6 bromine 
• 10049-21-5 sodium dihydrogenphosphate 

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Optical study of gamma irradiated Sodium metaphosphate (cas 10361-03-2) glasses containing divalent metal oxide MO (ZnO or CdO)07/30/2019

Sodium metaphosphate glasses containing divalent metal oxide, ZnO or CdO with composition 50 P2O5 – (50 − x) Na2O – x MO (ZnO, or CdO) where x = 0, 10, 20 (mol%) were prepared by conventional melt method. UV/visible spectroscopy and FTIR spectroscopy are measured before and after exposing to s...detailed

Structure properties relationship in calcium Sodium metaphosphate (cas 10361-03-2) and polyphosphate glasses07/29/2019

Two series of glasses, the first with the formula (50-x/2)Na2O-xCaO-(50-x/2)P2O5 and an oxygen over phosphorus O/P ratio between 3 and 3.33 and the second with the composition (50-x)Na2O-xCaO-50P2O5 with an O/P = 3, were obtained by melt quenching and studied in order to understand the effects o...detailed

Optical, structural and thermal properties of Sodium metaphosphate (cas 10361-03-2) glasses containing Bi2O3 with interactions of gamma rays07/28/2019

Sodium metaphosphate glasses with successive increasing added Bi2O3 contents (5–40%) were prepared to improve their chemical stability and increase their optical and thermal properties through the additional building BiO6 and BiO3 units. The optical spectrum of the base metaphosphate glass reve...detailed

Relevant articles and documents

Crystal structures and local environments of NASICON-type Na3FeV(PO4)3and Na4FeV(PO4)3positive electrode materials for Na-Ion batteries

In this work, we investigate the crystal chemistry of Fe/V-mixed NASICON [sodium (Na) Super Ionic CONductor] compositions Na3FeV(PO4)3 and Na4FeV(PO4)3 that are structurally related to Na3V2(PO4)3, a positive electrode for Na-ion batteries. To synthesize Na4FeV(PO4)3, various synthesis routes (solid-state, sol-gel-assisted, and electrochemical syntheses) were investigated. Direct syntheses resulted in the formation of a NASICON-type phase in the presence of NaFePO4 and Na3PO4 impurities. The successful preparation of pure Na4FeV(PO4)3 has been achieved by the electrochemical sodiation of Na3FeV(PO4)3. Both synchrotron X-ray absorption and M?ssbauer spectroscopy allowed probing the local V and Fe environments and their oxidation states in Na3FeV(PO4)3 and Na4FeV(PO4)3. Na3FeV(PO4)3 crystallizes in the space group C2/c (a = 15.1394(2) ? b = 8.72550(12) ? c = 21.6142(3) ? β = 90.1744(9)° and Z = 12), and it is isostructural to an ordered α-form of Na3M2(PO4)3 (M = Fe, V). It presents a superstructure due to Na+ ordering, as confirmed by differential scanning calorimetry and in situ temperature X-ray diffraction. The electrochemically sodiated Na4FeV(PO4)3 powder crystallizes in the space group R3ˉ c (a = 8.94656(8) ?, c = 21.3054(3) ?, and Z = 6) within which the two sodium sites, Na(1) and Na(2), are almost fully occupied. Na4FeV(PO4)3 allows the electrochemical extraction of 2.76 Na+ per formula unit within the voltage range of 1.3-4.3 V versus Na+/Na through the FeIII/II, VIV/III, and VV/IV redox couples. This identifies an interesting material for Na-ion batteries.

Synthesis and structure of bis-hexaaquasodium bis-nitrilotris(methylenephosphonato)decaaquamonohydrohexasodiumlanthanate trihydrate [Na(H2O)6]2[LaNa6H(H2O)10{N(CH2PO3)3}2] · 3H2O

A complex salt of nitrilotris(methylenephosphonic acid) with sodium and lanthanum was prepared, isolated, and studied. The salt [Na(H2O)6]2[LaNa6H(H2O)10{N(CH2PO3)3}2] · 3H2O crystallizes in space group P21/c, Z = 2, a = 11.86630(10), b = 10.55060(10), c = 19.99270(10) ?, β = 94.6760°. The La coordination polyhedron is a virtually regular rhombohedron. The Na atom is coordinated at the vertices of a distorted octahedron. Both ligand molecules chelate the La atom; each PO3 group forms a La–O–P–O–Na bridge; the ligand denticity is 7.