Production and Syntheses
The largest scale production of nickel chloride involves the extraction with hydrochloric acid of nickel matte and residues obtained from roasting refining nickel-containing ores.
NiCl2·6H2O is rarely prepared in the laboratory because it is inexpensive and has a long shelf-life. The hydrate can be converted to the anhydrous form upon heating in thionyl chloride or by heating under a stream of HCl gas. Simply heating the hydrates does not afford the anhydrous dichloride.
- NiCl2·6H2O + 6 SOCl2 → NiCl2 + 6 SO2 + 12 HCl
The dehydration is accompanied by a color change from green to yellow.
Read more about this topic: Nickel(II) Chloride
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