CALCIUM PHOSPHITE
- CAS NO.：21056-98-4
- Empirical Formula: CaHO3P
- Molecular Weight: 120.06
- MDL number: MFCD00053958
- EINECS: 244-182-1
- SAFETY DATA SHEET (SDS)
- Update Date: 2026-05-12 09:13:37
What is CALCIUM PHOSPHITE?
Description
Calcium phosphite can have the molecular formula of
CaHPO3 or Ca(H2PO3)2. It is the former that appears
when a solution of phosphorous acid is reacted with
the oxide, hydroxide or carbonate:
CaO +H3PO3 ? CaHPO3·H2O +H2O
The product is a monohydrate. It can also be prepared
by the action of ammonium phosphite on calcium
chloride:
CaCl2 (aq) +NH4HPO3 (aq)
? CaHPO3·H2O +NH4Cl2 (aq)
A white, crystalline powder is obtained. The solubility
of CaHPO3·H2O has apparently not been determined
exactly. If heated to about 250°C, the anhydrate
results. This is stable when heated further up to about
320°C where it decomposes to form phosphine and
hydrogen:
3CaHPO3 + heat ? 2PH3 + 3Ca(PO3)2 +H2
Chemical properties
crystal(s); used in fertilizers and polymerization catalysts [MER06]
Physical properties
Calcium Phosphite is a colorless, monoclinic crystal which loses water at about 150°C and is slightly soluble in water but insoluble in alcohol. The anhydrate, calcium phosphite (CaHPO3), is stable in air even when heated at 95°C for 2 months.
Flammability and Explosibility
Not classified
Properties of CALCIUM PHOSPHITE
| Boiling point: | 400℃[at 101 325 Pa] |
| Density | 2.32[at 20℃] |
| pka | 6.69[at 20 ℃] |
| Water Solubility | slightly soluble H2O; insoluble alcohol [MER06] |
| EPA Substance Registry System | Phosphonic acid, calcium salt (1:1) (21056-98-4) |
Safety information for CALCIUM PHOSPHITE
Computed Descriptors for CALCIUM PHOSPHITE
New Products
3-AMINO-3-(2-FLUORO-PHENYL)-PROPIONIC ACID Pentadecanoic acid Hendecanoic acid 2-AMINO-3-METHYLQUINOLINE HYDROCHLORIDE 3-Hydroxypropionitrile DL-3-Amino-3-(2-methoxyphenyl)propionic acid 5-Bromo-2-Fluoropyridine 2,3-Diamino-5-Chloropyridine 2-Amino-3-Hydroxypyridine 2,6-Diamino Pyridine 4-Amino-2-Chloropyridine 2-Hydroxy-4-Picoline 4-(4-(Dimethylamino)-1-(4-fluorophenyl)-1-hydroxybutyl)-3-(hydroxymethyl)benzonitrile 4-Bromo-3-(ethoxymethyl)benzoic acid 2,4-Dichloro-5-methoxyaniline 4,6-Dichloro-2-(propylthio)pyrimidin-5-amine N2-Isobutyryl-2'-O-methylguanosine 2-chloro-5-methylpyridin-4-amine 4-Bromobenzaldehyde 2-Chloro-6-nitro benzothiazole 2-Amino-4-phenyl-thiazole 4-Chloro-2-methyl quinoline 2-(Chloromethyl) quinazolin-4(3H)-one 5-Phenyl-[1,3,4]-thiadiazol-2-amineRelated products of tetrahydrofuran
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