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Calcium tartrate

Calcium tartrate

IUPAC name	2,3-Dihydroxybutendioic acid calcium salt
Identifiers
CAS number	[3164-34-9] dihydrate [5892-21-7] anhydrous
SMILES	[Ca++]-OC(=O)C(O)C(O)C(=O)O-
Properties
Molecular formula	CaC₄H₄O₆
Molar mass	188.15 g/mol (anhydrous) 260.21 g/mol (tetrahydrate)
Appearance	hygroscopic white powder or colorless crystals
Density	1.817 g/cm³ 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
Hazards
MSDS	Calcium tartrate
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references

Calcium tartrate is a byproduct of the wine industry, prepared from wine fermentation dregs. It finds use as a food preservative. Like tartaric acid, calcium tartrate has two asymmetric carbons, hence it has two chiral isomers and a non-chiral isomer. Most calcium tartrate of biological origin is the chiral levorotatory (–) isomer.