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: 2026-05-28 03:03:43
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
2-(2-Chlorophenyl)glycine Propiolic Acid 1-(3-Hydroxy-4-methoxyphenyl)-2-nitroethene (±)-amino(2-fluorophenyl)acetic acid trans-3-Benzyloxy-4-methoxy-beta-nitrostyrene 1-Pentadecanol 2,4-Dihydroxybenzaldehyde Dipropyl disulfide Pyrrolo[1,2-a]pyrimidine-6-carboxylic acid, 4,6,7,8-tetrahydro-4-oxo-, sodium salt (1:1), (6S) Obidoxime hydrochloride API 4 pentyn 1 ol N-Vinylformamide Methacrylate-PEG-Methacrylate, Mn:35000 2,4-Dihydroxyacetophenone 2-Chloro 5-Fluoro Pyridine Vasicinone 2-Chloroisonicotinic Acid Tween 80 or Polysorbate 80 2-Butyn-1-oL N-(4-Cyano-3-(trifluoromethyl)phenyl)-2-methyloxirane-2-carboxamide N-(4-fluoro-2-methoxy-5-nitrophenyl)-4-(1-methyl-1H-indol-3-yl)pyrimidin-2-amine Pirtobrutinib intd. 2-Pentyn-1-oL 4-NitrobenzotrifluorideRelated products of tetrahydrofuran
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