Calcium tartrate

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Calcium tartrate
Calcium tartrate.png
CAS number 3164-34-9 YesY,  (anhydrous)
5892-21-7] (tetrahydrate)
PubChem 3083790
ChemSpider 10606089 YesY
Jmol-3D images Image 1
Molecular 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/cm3 (tetrahydrate)
Melting point tetrahydrate decomposes at 160 °C
anhydrous decomposes at 650 °C
Solubility in water 0.037 g/100 ml (0 °C)
Crystal structure d or l rhombic
dl triclinic
MSDS Calcium tartrate
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 YesY (verify) (what is: YesY/N?)
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.