reaction occurs when an acid reacts with an equal amount of a base. This usually creates a solution of a salt and water. For example, hydrochloric acid reacts with sodium hydroxide to produce sodium chloride and water: HCl + NaOH → NaCl + Reaction between an acid and a carbonate or bicarbonate always yields carbonic acid as a product, which spontaneously decomposes into carbon dioxide and water. The release of carbon dioxide gas from the reaction mixture drives the reaction to completion. For example, a common, science-fair "volcano" reaction involves the reaction of acetic acid with sodium bicarbonate: + → + + Salt-free metathesis reaction In contrast to salt metathesis reactions, which are driven by the precipitation of solid salts, are salt-free reductions, which are deriven by formation of silyl halides, Salt-free metathesis reactions proceed homogeneously. See also Single displacement reaction References Chemical reactions