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Cobalt Nitrate: Cobalt Oxide Dissolved in Nitric Acid (Thorpe 1912)
Cobalt oxide dissolves in nitric acid to give cobalt nitrate, a red salt that crystallises with six molecules of water and is very soluble.
Result: red, deliquescent crystals of Co(NO3)2·6H2O.
Source: Thorpe, Dictionary of Applied Chemistry, vol. 2 (1912), Cobalt. Not given: amounts, acid strength, how it is crystallised. Danger: nitric acid burns and gives brown fumes. Picture drawn by Youblob.
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