Calcium tartrate

Calcium tartrate

Names
IUPAC name 2,3-Dihydroxybutanedioic acid calcium salt
Identifiers
CAS Number	3164-34-9 (anhydrous) 5892-21-7 (tetrahydrate)
ChemSpider	10606089
Jmol interactive 3D	Image
PubChem	3083790
InChI InChI=1S/C4H6O6.Ca/c5-1(3(7)8)2(6)4(9)10;/h1-2,5-6H,(H,7,8)(H,9,10);/q;+2/p-2 Key: GUPPESBEIQALOS-UHFFFAOYSA-L InChI=1/C4H6O6.Ca/c5-1(3(7)8)2(6)4(9)10;/h1-2,5-6H,(H,7,8)(H,9,10);/q;+2/p-2 Key: GUPPESBEIQALOS-NUQVWONBAP
SMILES [Ca+2].O=C([O-])C(O)C(O)C([O-])=O
Properties
Chemical formula	CaC4H4O6
Molar mass	190.16484 g/mol (anhydrous) 260.21 g/mol (tetrahydrate)
Appearance	hygroscopic white powder or colorless crystals
Density	1.817 g/cm^3 (tetrahydrate)
Melting point	tetrahydrate decomposes at 160 °C anhydrous decomposes at 650 °C
Solubility in water	0.037 g/100 ml (0 °C)
Structure
Crystal structure	d or l rhombic dl triclinic
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Calcium tartrate is a byproduct of the wine industry, prepared from wine fermentation dregs. It is the calcium salt of tartaric acid, an acid most commonly found in ripe grapes. Its solubility decreases with colder temperature, which results in the forming of whitish (in red wine often reddish) crystalline clusters as it precipitates. It finds use as a food preservative and acidity regulator. Like tartaric acid, calcium tartrate has two asymmetric carbons, hence it has two chiral isomers and a non-chiral isomer (meso-form). Most calcium tartrate of biological origin is the chiral levorotatory (–) isomer.

References