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HELLO!!! Cobalt(II) sulfate: Anhydrous cobalt(II)sulfate appears as red monoclinic crystals that melt at 96.8°C and become anhydrous at 420°C. It is soluble in water, slightly soluble in ethanol, and especially soluble in methanol.

Cobalt nitrate: Cobalt nitrate is a chemical salt formed from the metal cobalt and the nitrate ion. It is an oxidizer and is soluble in water. It is more commonly found as a hexahydrate.

It is deliquescent in moist air and soluble in most polar solvents. It is derived from reacting metallic cobalt or one of its oxides, hydroxides, or carbonate with nitric acid. It is commonly used in dyes and inks