Calcium phosphite

Structural formula
General
Surname	Calcium phosphite
other names	Calcium phosphonate
Molecular formula	CaHPO 3 CaHPO 3 H 2 O (monohydrate)
External identifiers / databases
CAS number 21056-98-4 EC number 244-182-1 ECHA InfoCard 100.040.150 PubChem 101199769 ChemSpider 11591059 Wikidata Q1026361
properties
Molar mass	120.06 g mol −1
Physical state	firmly
Melting point	> 300 ° C (decomposition)
safety instructions
GHS labeling of hazardous substances no GHS pictograms H and P phrases H: no H-phrases P: no P-phrases
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Calcium phosphite , also called calcium phosphonate , is a chemical compound from the group of phosphonates . It usually occurs as the monohydrate CaH (PO ₃ ) • H ₂ O. This is when heated above 200 ° C crystal water from.

Extraction and presentation

Calcium phosphite can be obtained by reacting phosphonic acid with calcium oxide .

${\displaystyle \mathrm {CaO+H_{3}PO_{3}\longrightarrow CaHPO_{3}+H_{2}O} }$

It is also formed as a by-product in the production of calcium hypophosphite Ca (H ₂ PO ₂ ) ₂ .

use

Calcium phosphite is used as a fertilizer and as a polymerization catalyst .

swell

1. ↑ ^{a b} Dale L. Perry, Sidney L. Phillips (Eds.): Handbook of Inorganic Compounds. CRC Press, Boca Raton FL et al. 1995, ISBN 0-8493-8671-3 .
2. ↑ There is not yet a harmonized classification for this substance . A labeling of calcium hydrogen phosphonate in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA), accessed on April 17, 2018, is reproduced from a self-classification by the distributor .