Monosodium citrate

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Monosodium citrate
Monosodium citrate.png
Other names
sodium dihydrogen 2-hydroxypropane-1,2,3-tricarboxylate
18996-35-5 N
ChEBI CHEBI:53258 YesY
ChemSpider 27304 N
Jmol-3D images Image
PubChem 23662352
Molar mass 214.11 g·mol−1
Except where noted otherwise, data is given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Monosodium citrate, or sodium dihydrogen citrate, is an acid salt with the chemical formula NaH2C6H5O7, or C3H4OH(COOH)2COONa. Since it has two remaining open spots on the citrate anion, it is used as a relatively strong sequestrant. It is used to prevent platelet clumping in blood samples. It is one of the 3 citric acid salts.


Monosodium citrate can be prepared through a partial neutralisation and subsequent crystallization of a bicarbonate or a carbonate with citric acid:

NaHCO3 (s) + C6H8O7 (aq) → NaC6H7O7 (aq) + CO2 (g) + H2O (l)


Monosodium citrate is a white fine or crystalline granular powder with a slightly acidic taste similar to citric acid. It is white color and odorless. It is highly soluble in water and practically insoluble in ethanol.


Monosodium citrate is used as an anticoagulant in donated blood.[citation needed]

See Also[edit]