|Calcium Carbonate||Calcium Chlorate||Calcium Chloride||Calcium Chromate(VI)||Calcium Citrate|
|Jmol-3D images||Image 1|
|Molar mass||64.099 g/mol|
|Appearance||White powder to grey/black crystals|
|Melting point||2,160 °C; 3,920 °F; 2,430 K|
|Boiling point||2,300 °C; 4,170 °F; 2,570 K|
|Solubility in water||decomposes|
|Crystal structure||Tetragonal |
|Space group||D174h, I4/mmm, tI6|
|Std enthalpy of
(what is: / ?)|
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Calcium carbide is a chemical compound with the chemical formula of CaC2. Its main use industrially is in the production of acetylene and calcium cyanamide.
The pure material is colorless, however pieces of technical-grade calcium carbide are grey or brown and consist of about 80–85% of CaC2 (the rest is CaO (calcium oxide), Ca3P2 (calcium phosphide), CaS (calcium sulfide), Ca3N2 (calcium nitride), SiC (silicon carbide), etc.). Because of presence of PH3 (phosphine), NH3 (ammonia), and H2S (hydrogen sulfide), the smell of technical-grade calcium carbide is part of the process or production and is produced intentionally to be unpleasant in larger concentrations, and noticeable in smaller ones, as a part of warning system for unwanted leaks, fires or explosion.
It is illegally used for ripening fruits in India, consumption of which can lead to cancer.