Electrolytes are substances that produce ions in water, allowing the solution to conduct electricity. Understanding how ions form helps explain why some solutions conduct strongly, others weakly, and some hardly at all.
An electrolyte is a substance that yields ions when dissolved in water, through a physical or chemical process. A nonelectrolyte dissolves without producing ions. Because ions carry charge, a solution can conduct electricity when it contains ions that are free to move.
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What is an electrolyte?
A substance that produces ions when dissolved in water, enabling the solution to conduct electricity.
What does strong electrolyte mean?
It means essentially all of the dissolved substance produces ions. The term describes the extent of ion production, not necessarily the substance's solubility.
What is an ion-dipole attraction?
It is the electrostatic attraction between an ion and a polar molecule. In water, these attractions help surround and solvate ions as an ionic solid dissolves.
How does KCl dissolve in water?
Polar water molecules attract the K⁺ and Cl⁻ ions, helping separate them from the crystal. The ions become hydrated, mobile particles in solution.
How does HCl form ions in water?
HCl transfers a proton to a water molecule, producing H₃O⁺ and Cl⁻. The reaction is essentially complete, making aqueous HCl a strong electrolyte.
Quiz questions
What makes a dissolved substance an electrolyte?Answer: It produces ions in solution, allowing the solution to conduct electricity.
A sparingly soluble ionic compound dissolves in water. If the small amount that dissolves separates nearly completely into ions, how is it classified?Answer: As a strong electrolyte, despite its low solubility.
Under comparable conditions, what does a brighter bulb in a solution-conductivity circuit generally indicate?Answer: Greater conductivity and a higher concentration of mobile ions.
When water molecules surround a positive ion, which part of each water molecule is attracted toward the ion?Answer: The oxygen end, which has a partial negative charge.
What happens when HCl reacts with water?Answer: It transfers a proton to water, producing hydronium and chloride ions.
Based on Chemistry 2e by Paul Flowers, Klaus Theopold, Richard Langley, William R. Robinson, PhD (OpenStax), licensed CC BY 4.0. Adapted into a summary, flashcards and quizzes.