Monocalcium phosphate

Monocalcium phosphate
Names
	IUPAC name Calcium bis(dihydrogen phosphate)
	Other names Acid calcium phosphate; Calcium acid phosphate; Calcium diorthophosphate; Calcium biphosphate; Calcium superphosphate; Monobasic calcium phosphate; Monocalcium orthophosphate; Phosphoric acid, calcium salt (2:1)
Identifiers
CAS Number	7758-23-8 ; 10031-30-8 (monohydrate) ;
3D model (JSmol)	Interactive image;
ChemSpider	22862 ;
ECHA InfoCard	100.028.943
E number	E341(i) (antioxidants, ...)
PubChem CID	24454;
UNII	701EKV9RMN ; 0N4E6L5449 (monohydrate) ;
CompTox Dashboard (EPA)	DTXSID2044262 ;
	InChI InChI=1S/Ca.2H3O4P/c;21-5(2,3)4/h;2(H3,1,2,3,4)/q+2;;/p-2 Key: YYRMJZQKEFZXMX-UHFFFAOYSA-L ; InChI=1/Ca.2H3O4P/c;21-5(2,3)4/h;2(H3,1,2,3,4)/q+2;;/p-2 Key: YYRMJZQKEFZXMX-NUQVWONBAY;
	SMILES OP(=O)(O)[O-].OP(=O)(O)[O-].[Ca+2];
Properties
Chemical formula	CaH4P2O8
Molar mass	234.05 g/mol
Appearance	White powder
Density	2.220 g/cm3
Melting point	109 °C (228 °F; 382 K)
Boiling point	203 °C (397 °F; 476 K) (decomposes)
Solubility in water	2 g/100 mL
Refractive index (nD)	1.5176
Structure
Crystal structure	Triclinic
Hazards
NFPA 704 (fire diamond)	1 0 0
Flash point	Non-flammable
Related compounds
Other anions	Calcium pyrophosphate
Other cations	Magnesium phosphate; Dicalcium phosphate; Tricalcium phosphate; Strontium phosphate
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Monocalcium phosphate is an inorganic compound with the chemical formula Ca(H₂PO₄)₂ ("AMCP" or "CMP-A" for anhydrous monocalcium phosphate). It is commonly found as the monohydrate ("MCP" or "MCP-M"), Ca(H₂PO₄)₂·H₂O. Both salts are colourless solids. They are used mainly as superphosphate fertilizers and are also popular leavening agents.

Names


IUPAC name Calcium bis(dihydrogen phosphate)
Other names Acid calcium phosphate Calcium acid phosphate Calcium diorthophosphate Calcium biphosphate Calcium superphosphate Monobasic calcium phosphate Monocalcium orthophosphate Phosphoric acid, calcium salt (2:1)
Identifiers
CAS Number	7758-23-8^Y 10031-30-8 (monohydrate)^Y
3D model (JSmol)	Interactive image
ChemSpider	22862^N
ECHA InfoCard	100.028.943
E number	E341(i) (antioxidants, ...)
PubChem CID	24454
UNII	701EKV9RMN^Y 0N4E6L5449 (monohydrate)^Y
CompTox Dashboard (EPA)	DTXSID2044262
InChI InChI=1S/Ca.2H3O4P/c;21-5(2,3)4/h;2(H3,1,2,3,4)/q+2;;/p-2^N Key: YYRMJZQKEFZXMX-UHFFFAOYSA-L^N InChI=1/Ca.2H3O4P/c;21-5(2,3)4/h;2(H3,1,2,3,4)/q+2;;/p-2 Key: YYRMJZQKEFZXMX-NUQVWONBAY
SMILES OP(=O)(O)[O-].OP(=O)(O)[O-].[Ca+2]
Properties
Chemical formula	CaH₄P₂O₈
Molar mass	234.05 g/mol
Appearance	White powder
Density	2.220 g/cm³
Melting point	109 °C (228 °F; 382 K)
Boiling point	203 °C (397 °F; 476 K) (decomposes)
Solubility in water	2 g/100 mL
Refractive index (n_D)	1.5176
Structure
Crystal structure	Triclinic
Hazards
NFPA 704 (fire diamond)	1 0 0
Flash point	Non-flammable
Related compounds
Other anions	Calcium pyrophosphate
Other cations	Magnesium phosphate Dicalcium phosphate Tricalcium phosphate Strontium phosphate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is ^YN ?) Infobox references