7789-79-9
Calcium hypophosphite
CAS: 7789-79-9
Molecular Formula: Ca(H2PO2)2
7789-79-9 - Names and Identifiers
| Name | Calcium hypophosphite |
| Synonyms | Lime hypophosphite CALCIUM PHOSPHINATE calcium phosphinate CALCIUM HYPOPHOSPHITE Calcium hypophosphite Calcium hydrophosphite Calcium bisphosphinate CALCIUMHYPOPHOSPHITE,PURIFIED CALCIUM HYPOPHOSPHITE TECHNICAL CALCIUM HYPOPHOSPHITE EXTRA PURE, DAC |
| CAS | 7789-79-9 |
| EINECS | 232-190-8 |
| InChI | InChI=1/Ca.HO2P/c;1-3-2/h;(H,1,2)/q+2;/p-1 |
| InChIKey | XJPMAXXEWYLDCQ-UHFFFAOYSA-L |
7789-79-9 - Physico-chemical Properties
| Molecular Formula | Ca(H2PO2)2 |
| Molar Mass | 170.05 |
| Density | 2.243[at 20℃] |
| Melting Point | decomposes [ALF93] |
| Boling Point | 480℃[at 101 325 Pa] |
| Water Solubility | Soluble in water. Practically insoluble in alcohol. Slightly soluble in glycerol |
| Appearance | white monoclinic crystals |
| Merck | 14,1675 |
| pKa | 12.6[at 20 ℃] |
| Sensitive | Hygroscopic |
| Physical and Chemical Properties | White to gray monoclinic crystals. soluble in water, insoluble in alcohol. The solubility in water is 16.7g/g water at room temperature. |
| Use | Used as corrosion inhibitor, electroless nickel plating aids, animal nutrition supplements |
7789-79-9 - Risk and Safety
| Hazard Symbols | F - Flammable |
| Risk Codes | 11 - Highly Flammable |
| Safety Description | S7 - Keep container tightly closed. S15 - Keep away from heat. |
| UN IDs | UN 3180 4.1/PG 2 |
| WGK Germany | 3 |
| TSCA | Yes |
| Hazard Class | 4.1 |
7789-79-9 - Upstream Downstream Industry
| Raw Materials | White phosphorus |
7789-79-9 - Nature
Open Data Verified Data
white to gray monoclinic crystals. Soluble in water, insoluble in alcohol. Solubility in water at room temperature is 16.7g/log water.
Last Update：2024-01-02 23:10:35
7789-79-9 - Preparation Method
Open Data Verified Data
yellow phosphorus-lime milk method: Lime is digested to make milk of lime, and then the yellow phosphorus and milk of lime are stirred in the reactor to react at 98 ℃ to form calcium hypophosphite, attention should be paid to the safety protection, filter to remove the non-reactants, and then pass through the two
Carbon oxide, further remove a small amount of calcium hydroxide, the calcium hypophosphite solution is clarified, concentrated, filtered, the filtrate is added to activated carbon decolorization, and then filtered, the filtrate after adjusting the pH value, concentrated, cooled crystallization, centrifugal separation, the resultant calcium hypophosphite was dried and obtained.
Last Update：2022-01-01 11:03:20
7789-79-9 - Application
Open Data Verified Data
used as a nutritional agent for animals. Used in the manufacture of pharmaceuticals.
Last Update：2025-08-19 16:24:40
7789-79-9 - Safety
Open Data Verified Data
lined with polyethylene plastic bag, plastic woven bag, each bag of 25kg net weight. Storage and Transportation see consumption of sodium hexametaphosphate.
Last Update：2022-01-01 11:03:20
7789-79-9 - Reference Information
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Overview | calcium hypophosphite, also ranked Calcium dihydrogen phosphate, chemical formula Ca(H2PO2)2, white scaly crystals. Bitter in taste. Soluble in water, the aqueous solution is weakly acidic, insoluble in alcohol. Heated to 300 deg C above the decomposition of the formation of flammable and toxic phosphine. Commonly used as analytical reagents, such as the determination of arsenic, but also used in medicine, electroless nickel plating. |
| properties | calcium hypophosphite is white scaly Crystal, odorless, bitter; Relative density (specific gravity):1.634; soluble in water, the aqueous solution is weakly acidic, insoluble in alcohol; Heated to more than 300 ° C decomposition of flammable and toxic phosphine. |
| preparation method | The yellow phosphorus and calcium hydroxide were placed in a reactor made of iron sheet, the use of heat when the evolution of water vapor to remove air, is not burning yellow phosphorus in the reactor, and calcium hydroxide reaction to generate calcium hypophosphite, the reaction formula: |
| Use | 1. Calcium hypophosphite is mainly used as the basic raw material for preparing other hypophosphates, for example, sodium hypophosphite or potassium hypophosphite can be prepared by interacting with sodium carbonate or potassium; Manganese hypophosphite or iron hypophosphite can be prepared by interacting with manganese sulfate or iron chloride; with sulfuric acid or oxalic acid, can be prepared hypophosphite. These products can be used as reducing agents in chemical analysis and as stabilizing agents in reagents. 2. Used as analytical reagents, such as the determination of arsenic; 3. Used in medicine, electroless nickel plating, etc. used as corrosion inhibitor, electroless nickel plating aid, animal nutrition supplement, etc. used as analytical reagent, also used in pharmaceutical industry used as animal nutrition agent. Used in the manufacture of pharmaceuticals. used as antioxidant and analytical reagent |
| note | calcium hypophosphite will burst when mixed with other oxidants such as nitrate, chlorate, etc., ground or heated. |
| production method | yellow phosphorus-milk of lime method lime is digested to make milk of lime, then the yellow phosphorus and milk of lime are stirred in the reactor, reaction at 98 ℃ to produce calcium hypophosphite, phosphine is produced during the reaction, attention should be paid to safety protection, filtering to remove unreacted substances, and then into the carbon dioxide, further remove a small amount of calcium hydroxide, the calcium hypophosphite solution to clarify, the filtrate is concentrated and filtered, decolorized by adding activated carbon, and then filtered. After adjusting the pH value of the filtrate, the filtrate is concentrated, cooled and crystallized, centrifuged and dried to obtain calcium hypophosphite finished product. Its CaO H2O → Ca(OH)23Ca(OH)2 2P4 6H2O → 3Ca(H2PO2)2 2PH3 ↑ |
| category | explosive substance |
| explosive hazard characteristics | friction sensitive explosion mixed with potassium chlorate |
| flammability hazard characteristics | toxic phosphorus oxide fumes from thermal decomposition |
| storage and transportation characteristics | The warehouse is ventilated and dried at low temperature; Move gently |
| fire extinguishing agent | water, dry powder, foam, carbon dioxide |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-09 20:49:11
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