Monosodium phosphate

Monosodium phosphate
IUPAC name Sodium dihydrogen phosphate
Identifiers
CAS number	7558-80-7 Y
PubChem	24204
ChemSpider	22626 Y
ChEBI	CHEBI:37585 Y
Jmol-3D images	Image 1
SMILES [Na+].[O-]P(=O)(O)O
InChI InChI=1S/Na.H3O4P/c;1-5(2,3)4/h;(H3,1,2,3,4)/q+1;/p-1 Y Key: AJPJDKMHJJGVTQ-UHFFFAOYSA-M Y
Properties
Molecular formula	NaH2PO4
Molar mass	119.98 g/mol
Appearance	White powder or crystals
Solubility in water	59.9 g/100 mL (0°C)
Hazards
EU Index	Not listed
NFPA 704	0 1 0
Flash point	Non-flammable
Related compounds
Other cations	Monopotassium phosphate Monoammonium phosphate
Related compounds	Disodium phosphate Trisodium phosphate
Y phosphate (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Monosodium phosphate (NaH₂PO₄), also known as anhydrous monobasic sodium phosphate is a chemical compound of sodium with a phosphate counterion. It is used as a laxative and, in combination with other sodium phosphates, as a pH buffer.

The pKa is 6.8-7.20 (depending on the physicochemical characteristics during pKa determination)^[1]. The sodium chloride equivalent value, or E-Value, is 0.49. It is soluble in 4.5 parts water. It is most commonly available as colorless crystals or a white powder. It is insoluble in alcohol. It is also formed when a sodium halide compound reacts with phosphoric acid.

Notes

1. ^ Salaun, F.: "Influence of mineral environment on the buffering capacity of casein micelles", "Milkwissenschaft", 62(1):3