Acid–base reaction, a type of chemical process typified by the exchange of one or more hydrogen ions, H +, between species that may be neutral (molecules, such as water, H 2 O; or acetic acid, CH 3 CO 2 H) or electrically charged (ions, such as ammonium, NH 4 +; hydroxide, OH −; or carbonate, CO 3 2−).
A chemical decomposition reaction or analysis reaction is one of the most common types of chemical reactions. In a decomposition reaction a compound is broken into smaller chemical species. AB → A + B. In some cases, the reactant breaks into its component elements, but a decomposition may involve breakdown into any smaller molecules.