Product Name
Disodium hydrogenorthophosphate
Category
Metal & Ceramic Materials
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.
Synonyms
DIBASIC SODIUM PHOSPHATE;DINATRII PHOSPHAS DIHYDRICUS;DINATRII PHOSPHAS ANHYDRICUS;DISODIUM PHOSHATE;DISODIUM PHOSPHATE DIHYDRATE;DISODIUM PHOSPHATE;DI-SODIUM HYDROGEN ORTHOPHOSPHATE;DI-SODIUM HYDROGEN ORTHOPHOSPHATE 2H₂O
IUPAC Name
disodium;hydrogen phosphate
Molecular Weight
141.959g/mol
Molecular Formula
Anhydrous:Na2HPO4; Hydrate: Na2HPO4? nH₂O (n = 2, 7 or 12);HO4PNa2;Na2HPO4;HNa2O4P
Canonical SMILES
OP(=O)([O-])[O-].[Na+].[Na+]
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
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;231-448-7
Exact Mass
141.940784g/mol
Monoisotopic Mass
141.940784g/mol
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/
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/
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