Description
Sodium phosphate, dibasic appears as a colorless to white crystalline solid. Soluble in water. The primary hazard is the threat to the environment. Immediate steps should be taken to limit spread to the environment. Used as a fertilizer, in pharmaceuticals, in food processing, and for many other uses.;DryPowder; Liquid; PelletsLargeCrystals;Anhydrous disodium hydrogen phosphate is a white, hygroscopic, odourless powder. Hydrated forms available include the dihydrate: a white crystalline, odourless solid; the heptahydrate: white, odourless, efflorescent crystals or granular powder; and the dodecahydrate: white, efflorescent, odourless powder or crystals;WHITE OR COLOURLESS HYGROSCOPIC CRYSTALS OR POWDER.
IUPAC Name
disodium; hydrogen phosphate
Molecular Weight
141.96
Molecular Formula
HNa2O4P
Canonical SMILES
[Na+].[Na+].[O-]P([O-])(=O)O
InChI
InChI=1S/2Na.H3O4P/c;;1-5(2,3)4/h;;(H3,1,2,3,4)/q2*+1;/p-2
InChI Key
BNIILDVGGAEEIG-UHFFFAOYSA-L
Melting Point
250 oC decomp.
Density
1.8 to 2.5 at 77 °F (USCG, 1999);approx 1.7 g/cu cm;0.5-1.2 g/cm³
Solubility
greater than or equal to 100 mg/mL at 68° F (NTP, 1992);Freely soluble in water. Insoluble in ethanol;11.8 g/100 g water at 25 °C;Soluble in 8 parts water, much more soluble in hot water. Solubility per 100 gal water increases from 14 lbs at slightly >0 °C to over 900 lbs at 95 °C. Insoluble in alcohol. /Anhydrous/;Solubility in water, g/100ml at 20 °C: 7.7
Color Form
Colorless, translucent crystals or white powder.;White, hygroscopic powder
Complexity
46.5
Covalently-Bonded Unit Count
3
Decomposition
When heated to decomposition it emits toxic fumes of /phosphorous and sodium oxides/.;~250 °C
EC Number
231-448-7
Exact Mass
141.9407
Formal Charge
0
H-Bond Acceptor
4
H-Bond Donor
1
Heavy Atom Count
7
ICSC Number
1129
LogP
-5.8 (calculated)
MDL Number
MFCD00003496
MeSH Entry Terms
dibasic sodium phosphate, anhydrous;disodium acid phosphate;disodium hydrogen phosphate;disodium hydrogen phosphate anhydrous;monosodium dihydrogen phosphate;neutral sodium hydrogen phosphate;phosphoric acid, disodium salt;phosphoric acid, disodium salt, 32P-labeled;phosphoric acid, disodium salt, anhydrous;phosphoric acid, disodium salt, dodecahydrate;phosphoric acid, disodium salt, heptahydrate;phosphoric acid, monosodium salt;phosphoric acid, monosodium salt, anhydrous;phosphoric acid, sodium (2:3) salt;phosphoric acid, sodium salt;phosphoric acid, trisodium salt;phosphoric acid, trisodium salt , 32P-labeled;phosphoric acid, trisodium salt , dodecahydrate;sodium biphosphate;sodium dihydrogen orthophosphate;sodium dihydrogen phosphate;sodium hydrophosphate;sodium phosphate;sodium phosphate monobasic anhydrous;sodium phosphate, dibasic;sodium phosphate, dibasic (anhydrous);sodium phosphate, disodium salt;sodium phosphate, monobasic;sodium phosphate, monobasic anhydrous;sodium phosphate, tribasic;sodium phosphate, tribasic, dodecahydrate;trisodium phosphate;trisodium phosphate dodecahydrate
Monoisotopic Mass
141.9407
Odor
NONE
Other Experimental
Hygroscopic; converted to sodium pyrophosphate at about 240 °C.;Colorless crystals; 11.8 G sol in 100 cc water at 25 °C /Disodium phosphate heptahydrate/;Density 1.679, loses 5H₂O at 48 °C /Disodium phosphate heptahydrate/;Colorless, rhombic or monoclinic, white powder; 87.4 g sol in 100 cc water at 80 °C; Index of refraction: 1.432, 1.436, 1.437; efflorescent /Disodium phosphate dodecahydrate/;MP 35 °C, density 1.5235, readily loses 12H₂O at 100 °C /Disodium phosphate dodecahydrate/;Rhombic bispheroidal crystals; Index of refraction: 1.463 /Disodium phosphate dihydrate/;MP: loses H₂O at 92.5 °C; Specific gravity: 2.066 at 15 °C /Disodium phosphate dihydrate/;100 g sol in 100 ml water at 50 °C; 117 g sol in 100 ml water at 80 °C. /Disodium phosphate dihydrate/;11.8 g sol in 100 ml water at 25 °C /Disodium phosphate dodecahydrate/;Hygroscopic. On exposure to air will absorb from 2 to 7 mols of water depending on the temperature and humidity.;Crystals or granular powder. Stable in the air. Specific gravity 1.7. Soluble in 4 parts water, more soluble in boiling water; practically insoluble in alcohol. The aqueous solution is alkaline, pH=9.5. /Heptahydrate/;Translucent crystals or granules; readily loses 5 mols of water on exposure to air at ordinary temp. Melting point 34-35 °C (when it contains the full 12 mols of H₂O). Specific gravity 1.5. Soluble in 3 parts water; practically insoluble in alcohol. Aqueous solution is alkaline, pH=9.5. /Dodecahydrate/
Physical State
White powder, crystals, or lumps
Rotatable Bond Count
0
RTECS Number
WC4500000
Stability
On exposure to air, it absorbs 2-7 moles water depending on humidity and temperature.;Stable in air. /Disodium Phosphate Heptahydrate/;Readily loses 5 mols water on exposure to air at ordinary temp. /Disodium Phosphate Dodecahydrate/
UNII
22ADO53M6F
UN Number
3082
