Metal Ion: An electrically charged atom or group of atoms formed by losing electrons. Barium ion is an example of a metal ion since it has lost two electrons.
Precipitation Reaction:A type of chemical reaction where two aqueous solutions react to form an insoluble solid called a precipitate. Barium chloride can participate in precipitation reactions by reacting with certain anions.
Solubility:The ability of a substance to dissolve in a given solvent at a specific temperature and pressure. Barium chloride is highly soluble in water, meaning it dissolves easily to form ions when mixed with water.