Monosodium citrate

Monosodium citrate

Other names sodium dihydrogen 2-hydroxypropane-1,2,3-tricarboxylate
Identifiers
ChemSpider	5989^Y
ChEBI	CHEBI:53258^Y
ChEMBL	CHEMBL1355^Y
Jmol-3D images	Image 1
SMILES [Na+].[Na+].[Na+].O=C([O-])CC(O)(C([O-])=O)CC(=O)[O-]
InChI InChI=1S/C6H8O7.3Na/c7-3(8)1-6(13,5(11)12)2-4(9)10;;;/h13H,1-2H2,(H,7,8)(H,9,10)(H,11,12);;;/q;3+1/p-3^Y Key: HRXKRNGNAMMEHJ-UHFFFAOYSA-K^Y InChI=1/C6H8O7.3Na/c7-3(8)1-6(13,5(11)12)2-4(9)10;;;/h13H,1-2H2,(H,7,8)(H,9,10)(H,11,12);;;/q;3+1/p-3 Key: HRXKRNGNAMMEHJ-DFZHHIFOAL
Properties
Molecular formula	C₆H₇NaO₇
Molar mass	214.11 g mol⁻¹
Y (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 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.

Preparation

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)