Calcium tartrate

Template:Chembox header | Calcium tartrate
Calcium tartrate
Template:Chembox header | General
Systematic name	2,3-Dihydroxybutendioic acid calcium salt
Molecular formula	CaC4H4O6
SMILES	[Ca++]-OC(=O)C(O)C(O)C(=O)O-
Molar mass	188.15 g/mol (anhydrous) 260.21 g/mol (tetrahydrate)
Appearance	hygroscopic white powder or colorless crystals
CAS number	[3164-34-9] dihydrate [5892-21-7] anhydrous
Template:Chembox header | Properties
Density	1.817 g/cm³ tetrahydrate
Solubility in water	0.037 g/100 ml (0 °C)
HCl ethanol	soluble slightly soluble
Melting point	tetrahydrate decomposes at 160 °C anhydrous decomposes at 650 °C
Chiral rotation [α]D	?°
Template:Chembox header | Structure
Crystal structure	d or l rhombic dl triclinic
Template:Chembox header | Hazards
MSDS	Calcium tartrate
Main hazards	?
NFPA 704
R/S statement	R: ? S: ?
RTECS number	?
Template:Chembox header | Supplementary data page
Structure and properties	n, εr, etc.
Thermodynamic data	Phase behaviour Solid, liquid, gas
Spectral data	UV, IR, NMR, MS
Template:Chembox header | Related compounds
tartaric acid
Template:Chembox header | 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.