SODIUM HYPOPHOSPHITE

PRODUCT IDENTIFICATION
CAS NO. 7681-53-0

SODIUM HYPOPHOSPHITE
EINECS NO. 231-669-9
FORMULA NaH2PO2.H2O
MOL WT. 105.99

H.S. CODE

 2835.10
TOXICITY Oral rat LD50: 1584 mg/kg
SYNONYMS Phosphinic acid, sodium salt; sodium monophosphate;
Hypophosphorous Acid Monosodium Salt; Natriumhypophosphit (German); Phosphinic Acid Monosodium Salt; Sodium Phosphinate; Fosfinato de sodio (Spanish); Phosphinate de sodium (French);
SMILES  

CLASSIFICATION

 

PHYSICAL AND CHEMICAL PROPERTIES
PHYSICAL STATE White Crystalline, hydroscopic
MELTING POINT

 
BOILING POINT 200 C (Decomposes)
SPECIFIC GRAVITY  
SOLUBILITY IN WATER soluble
pH 5.5 - 8.5
VAPOR DENSITY  

AUTOIGNITION

 

NFPA RATINGS

 Health: 1 Flammability: 1 Reactivity: 2

REFRACTIVE INDEX

 
FLASH POINT Not considered to be a fire hazard but forms spontaneously flammable phosphine gas when heated.
STABILITY Stable under ordinary conditions but explosive in contact with oxidizers.

APPLICATIONS
Hypophosphorous acid is the phosphorus oxo acid or hydroxy phosphine oxide, with monobasic character. The term phosphinic acid is for the descriptive presentation of derivatives or salts which hydrogen atoms bound to phosphorus are replaced by organic groups, called phosphinates. The term hypophosphite is also used for any salt, ester or anion derived from the name of hypophosphorous acid. Hypophosphorous acid is a low-melting point compound soluble in water. It is a powerful reducing agent. Hypophosphorous acid and its sodium salt (sodium hypophosphite) are used as powerful reducing agents in various field. (Hypophosphorous acid has an advantage of easy implementation in solution.) They are used in:
  • Pharmaceutic aid as antioxidant
  • Retrieval of non-ferrous
  • Ingredient of electroless plating solutions.
  • Water treatment agent
  • Meat preservative.
  • Prevent the discoloration of polymers
  • Production of chemicals
SALES SPECIFICATION

APPEARANCE

White Crystalline

NaH2PO2.H2O
100% min

Na2HPO3

 0.5% max
SO4 0.03% max

Fe

 0.0003% max

Ca

 0.005% max

Cl

 0.03% max
TRANSPORTATION
PACKING 25kgs, 50kgs , 500kgs in bag
HAZARD CLASS Not regulated
UN NO.  

GENERAL DESCRIPTION OF PHOSPHOROUS ACID

Phosphorous Acid is a clear to yellowish crystalline solid with a garlic like odour melting at 73 C, decomposes at 200 C. It is very soluble in water and in alcohol. This compound contains one direct P-H bond (which is not very acidic) and only two hydrogens bonded to oxygen (which are acidic). The structure of this material is more correctly written (HO)2HPO. For this reason, this dibasic acid forms two series of salts; the one contains the dihydrogen phosphite ion, H2PO3 - , and the other contains the hydrogen phosphite ion, HPO32-. This is an unstable compound that readily converts to phosphoric acid (H3PO4) in the presence of oxygen or on heating above 180 C. It is prepared by hydrolysis of phosphorus trichloride or tetraphosphorus hexaoxide. Phosphorous acid and its salts called phosphites are used as reducing agents in chemical industry because of easy oxidation property to phosphoric acid.