Electrolytes vs. Nonelectrolytes
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An electrolyte produces ions when dissolved, letting its solution conduct electricity; a nonelectrolyte dissolves as intact, nonconducting molecules.
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Saltwater conducts because dissolved NaCl separates into mobile ions, while sugar water at the same concentration does not.
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Conductivity depends on whether ions are present, not on how much solute dissolves — a dilute electrolyte still conducts, only weaker.