Hydrate
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In chemistry, a hydrate is a substance that contains water or its constituent elements. The chemical state of the water varies widely between different classes of hydrates, some of which were so label
Cobalt chloride
Cobalt chloride hexahydrate sample
Cobalt(II) chloride
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Cobalt chloride refers to inorganic compounds with the formula CoCl2·n. These compounds include anhydrous CoCl2 as well as several hydrates. The anhydrous form is a blue solid; the dihydrate is purple
Hydrate
…heavy water in which the constituent hydrogen is the isotope deuterium, then the term deuterate may be used in place of hydrate. A colorful example is cobalt(II) chloride, which turns from blue to red upon hydration, and can therefore be used as a water indicator. The notation "hydrated compound⋅nH2O", where n is the…
Cobaltous chloride
Cobaltous chloride anhydrous
The deep blue colour of this moisture indicating silica gel is due to cobalt chloride. When hydrated the colour changes to a light pink/purple.