electrolyte, electrical conductor in which current is carried by ions rather than by free electrons (as in a metal). Electrolytes include water solutions of acids, bases, or salts; certain pure liquids; and molten salts. Gases may act as electrolytes under conditions of high temperature or low pressure. All inorganic acids, bases, and salts are electrolytes. Electrolytic substances are classified as strong or weak according to how readily they dissociate into conducting ions. Potassium chloride and sodium hydroxide are strong electrolytes; they are almost completely dissociated when in solution or fused. Acetic acid is a weak electrolyte. An electrolyte is decomposed when a current passes through it (see electrolysis).

Substance that conducts electric current as a result of dissociation of its molecules into positively and negatively charged particles called ions. The most familiar electrolytes are acids, bases, and salts, which ionize when dissolved in polar solvents such as water. Many salts, including sodium chloride, behave as electrolytes when melted in the absence of solvent, since they have ionic bonds. The most commonly used electrolytes are dissolved metal salts (for electroplating metals) and acids (in electric batteries). Seealso electrolysis.

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