[structure or molecular formula]
CoCl 2 ·6H 2 O
[density] relative density (25 ° C): 1.925 (six water), 3.356 (anhydrous)
[melting point (°C)] 86 (six water)
ã€Properties】
Hexahydrate: red crystal, anhydrate: light blue powder.
ã€Solubility】
Liushui: soluble in water, soluble in ethanol, ether and acetone; anhydrous: soluble in ethanol, acetone, nitrobenzene.
ã€use】
Used in the manufacture of barometers, hydrometers, hidden inks, etc. The cobalt chloride test paper is blue when dry and turns pink when wet. A certain amount of cobalt chloride is added to the silica gel to indicate the degree of moisture absorption of the silica gel.
[preparation or source]
It is prepared by the action of cobalt oxide and hydrochloric acid.
ã€other】
The hexahydrate is deliquescent in the air, and when it is heated to 120-140 ° C, it loses crystal water and becomes an anhydrate.
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