Hypophoaphoeous acid , AR,50wt.%inH2O , 6303-21-5
Synonym(s):
Hypophosphorous acid;Phosphinic acid
CAS NO.：6303-21-5
Empirical Formula: HO2P
Molecular Weight: 63.9805
MDL number: MFCD02183592
EINECS: 228-601-5
PRODUCT Properties
| Melting point: | -25 °C |
| Boiling point: | 108 °C (759.8513 mmHg) |
| Density | 1.206 g/mL at 20 °C(lit.) |
| vapor pressure | <17 mmHg ( 20 °C) |
| storage temp. | no restrictions. |
| solubility | very soluble in H2O, ethanol, ethyl ether |
| pka | pK1 1.1. |
| form | hygroscopic crystals or colorless oily liquid |
| color | Colorless |
| PH | pKa1= 1.00(25℃) |
| Water Solubility | SOLUBLE |
| Merck | 13,4894 |
| Stability: | Stable. Incompatible with strong bases. Reacts violently with oxidizing agents, strong bases, mercury (II) nitrate and mercury (II) oxide. Do not heat above 100 C. |
| InChIKey | GQZXNSPRSGFJLY-UHFFFAOYSA-N |
| CAS DataBase Reference | 6303-21-5(CAS DataBase Reference) |
| NIST Chemistry Reference | Hypophosphorous acid(6303-21-5) |
| EPA Substance Registry System | Phosphinic acid (6303-21-5) |
Description and Uses
This acid has the general formula ofH4P2O6 and differs from the other oxy-phosphorous acids. It has many peculiarities. It is formed along with phosphorous and phosphoric acids, when phosphorus is oxidized by moist air. If white phosphorus is exposed to air, and sodium acetate is addedto the liquidwhich forms, the somewhat insoluble sodium hypophosphate,Na2H2P2O6·6H2Oseparates. The sodium hypophosphate monohydrate, however, is very soluble and deliquescent at ～98.7 g/100 ml.
Hypophosphorous acid is primarily used for electroless nickel plating. It is involved in the reduction of arenediazonium salts. It acts as an additive in Fischer esterification reactions. Also, it serves as a neutralizing agent, antioxidant, catalyst in polymerization and poly condensation, and wetting agent. Further, it is used in the formulation of pharmaceuticals, discoloration of polymers, water treatment and retrieval of precious or non-ferrous metals. In addition to this, it is used as bleaching agents for plastics, synthetic fibers, decolorizing agent and for color stabilization during the manufacture of chemicals and several plastics.
Safety
| Symbol(GHS) |  GHS05 |
| Signal word | Danger |
| Hazard statements | H290-H314 |
| Precautionary statements | P234-P280-P301+P330+P331-P303+P361+P353-P304+P340+P310-P305+P351+P338 |
| Hazard Codes | C |
| Risk Statements | 34 |
| Safety Statements | 26-36/37/39-45 |
| RIDADR | UN 3264 8/PG 3 |
| WGK Germany | 1 |
| RTECS | SZ6400000 |
| TSCA | Yes |
| HazardClass | 8 |
| PackingGroup | II |
| HS Code | 28111990 |
| Hazardous Substances Data | 6303-21-5(Hazardous Substances Data) |
