On the ionic formula of ammonium acetate
The ionic formula of ammonium acetate is related to the micro-theory of chemistry. Ammonium ions are formed by the phase of nitrogen and hydrogen, and are positively charged. The formula is $NH_ {4 }^{+}$， Nitrogen is connected to the tetrahydrogen atom by a covalent bond, and the whole is positive monovalent due to the outer electron of nitrogen.

Acetate ion, derived from the ionization of acetic acid. Acetate is an organic weak acid. In its structure, the hydrogen of the carboxyl group is easily dissociated, and the rest is acetate. The ionic formula of acetate is $CH_ {3} COO ^ {-} $, carbon and hydrogen form a group, and the oxygen and carbon at the carboxyl group are connected by different bonds, resulting in the whole being negatively charged.

When ammonium acetate is in water, due to the polarity of water, the salt dissociates into ions. Ammonium ions and acetate ions are dispersed between water molecules and form ionic states. The two interact to maintain a certain equilibrium. The ion formula of ammonium acetate, $NH_ {4} CH_ {3} COO $, is actually the coexistence of $NH_ {4} ^ {+} $and $CH_ {3} COO ^ {-} $in water.

The exploration of this ionic formula is essential for chemical analysis and the understanding of reaction mechanism. Observing its behavior in solution can reveal the nature of many chemical changes. It is a basic knowledge in the fields of chemical industry and scientific research, and is related to the progress of many practices and research.