Monosodium citrate

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Monosodium citrate
Monosodium citrate.png
CAS number 18996-35-5 N
PubChem 23662352
ChemSpider 27304 N
ChEBI CHEBI:53258 YesY
Jmol-3D images Image 1
Molecular formula C6H7NaO7
Molar mass 214.11 g mol−1
Except where noted otherwise, data are 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 by the direct reaction of sodium carbonate or bicarbonate with citric acid:

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


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

See Also[edit]