Exploration of the chemical formula of nickel (ⅲ) acetate
The chemical formula of nickel (ⅲ) acetate requires detailed investigation of the valence state of nickel and the characteristics of acetate. For nickel, the chemical symbol is Ni, and the common valence states are + 2, + 3, etc. The ionic formula of acetate is $CH_3COO ^ - $, which is -1 valence state.

When nickel is + 3 valence, in order to make the compound electrically neutral, according to the principle that the sum of valence algebras is zero, three acetates are combined with one nickel (ⅲ) ion. Therefore, the chemical formula of nickel (ⅲ) acetate should be $Ni (CH_3COO) _3 $.

The derivation of this chemical formula is based on the basic principles of chemistry, the matching of valence states and the binding rules of ions. In chemical research and practice, clarifying the chemical formula of compounds is the cornerstone for exploring their properties, reactions and many other aspects.