Cobalt(II) hydroxide is written with the chemical formula Co(OH)2. The compound is formed by the combination of one ion of cobalt(II) and two ions of hydroxide.
The formula shows that one molecule of cobalt(II) hydroxide contains one atom of cobalt, two atoms of oxygen and two atoms of hydrogen. The number of atoms in the molecule is based on the charges carried by each element. The symbol for each element can be found on the periodic table of elements. Cobalt(II) hydroxide can be formed through the reaction of cobalt(II) chloride and nitrogen hydroxide. As a powder, it may appear with either a bluish-green or a reddish color.