二磷酸二钠

Description

disodium diphosphate · CAS 7782-95-8 · H2Na2O6P2. UNII MR6TW8IQ9X. Melting Point: 250 °C.

Identification

CAS Registry Number	7782-95-8
PubChem CID	24535
Molecular formula	H2Na2O6P2
IUPAC name	disodium;hydroxy-[hydroxy(oxido)phosphoryl]phosphinate
UNII (FDA)	MR6TW8IQ9X

Computed Descriptors

Molecular Weight	205.94
Hydrogen Bond Donor Count	2
Hydrogen Bond Acceptor Count	6
Rotatable Bond Count	1
Exact Mass	205.91220034
Monoisotopic Mass	205.91220034
Topological Polar Surface Area	121
Heavy Atom Count	10
Formal Charge	0
Complexity	131

Physical & Chemical Properties

Melting Point	250 °C

Physical description & handling notes

• Hexahydrate: Colorless solid; [HSDB]
• Soly in water at 25 °C: 2.0 g/100 ml; at 100 °C: 25.0 g/100 ml. Insol in alc. /Hexahydrate/
• Aqueous solutions have an acid reaction.
• COLORLESS, MONOCLINIC CRYSTALS; SOL IN DILUTE SULFURIC ACID, AMMONIUM HYDROXIDE; INSOL IN ETHANOL; INDEX OF REFRACTION: 1.468, 1.490, 1.504; DENSITY 1.849 /HEXAHYDRATE/
• Monoclinic plates from water. Specific gravity: 1.849. Becomes anhydr at 110 °C. /Hexahydrate/

Documented Uses

• Prepd by the oxidation of red phosphorus with sodium chlorite in water.
• Hypophosphoric acid, sodium salt (1:2): INACTIVE

Synonyms

Disodium hypophosphate; DISODIUM DIHYDROGEN HYPOPHOSPHATE; Sodium acid hypophosphate; UNII-MR6TW8IQ9X; MR6TW8IQ9X; Sodium dihydrogen hypophosphate; Disodium dihydrogen subphosphate; HSDB 374; 7782-95-8; EINECS 231-972-6; disodium dihydrogen hypodiphosphate; DISODIUM DIHYDROGEN HYPOPHOSPHATE [MI]; DISODIUM DIHYDROGEN HYPOPHOSPHATE [HSDB]; RefChem:135033; DTXCID801426007; Disodium diphosphate

Frequently Asked Questions

What are the CAS number and molecular formula of disodium diphosphate?

CAS 7782-95-8; molecular formula H2Na2O6P2; molecular weight — g/mol.

What other names is disodium diphosphate known by?

Disodium hypophosphate, DISODIUM DIHYDROGEN HYPOPHOSPHATE, Sodium acid hypophosphate, UNII-MR6TW8IQ9X, MR6TW8IQ9X, Sodium dihydrogen hypophosphate.

What are the key physical properties of disodium diphosphate?

Melting Point: 250 °C.

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.