A strong electrolyte is a solute that completely, or almost completely, ionizes or dissociates in a solution. These ions are good conductors of electric current in the solution.
Originally, a "strong electrolyte" was defined as a chemical that, when in aqueous solution, is a good conductor of electricity. With greater understanding of the properties of ions in solution its definition was replaced by the present one.
A concentrated solution of this strong electrolyte has a lower vapour pressure than that of pure water at the same temperature. Strong acids, strong bases, and soluble ionic salts that are not weak acids or weak bases are strong electrolytes.
Read more about Strong Electrolyte: Writing Reactions, Examples of Strong Electrolytes, See Also
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