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AP Chemistry Unit 6 – Solutions

AP Chemistry Unit 6 – Solutions. Lesson 2 – Electrolytes Book Section: 4.1. Dissociation. When an ionic substance dissolves in water, the solvent pulls the individual ions from the crystal and solvates them. This process is called dissociation . Dissociation.

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AP Chemistry Unit 6 – Solutions

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  1. AP ChemistryUnit 6 – Solutions Lesson 2 – Electrolytes Book Section: 4.1

  2. Dissociation • When an ionic substance dissolves in water, the solvent pulls the individual ions from the crystal and solvates them. • This process is called dissociation.

  3. Dissociation • An electrolyte is a substances that dissociates into ions when dissolved in water.

  4. Electrolytes • An electrolyte is a substances that dissociates into ions when dissolved in water. (Salt) • Anonelectrolyte may dissolve in water, but it does not dissociate into ions when it does so. (Sugar)

  5. Electrolytes and Nonelectrolytes Soluble ionic compounds tend to be electrolytes.

  6. Electrolytes and Nonelectrolytes Molecular compounds tend to be nonelectrolytes, except for acids and bases.

  7. Electrolytes • A strong electrolyte dissociates completely when dissolved in water. • NaCl(aq) Na+(aq) + Cl-(aq) • A weak electrolyte only dissociates partially when dissolved in water. • They can conduct electricity in solution. (Demo)

  8. Strong Electrolytes Are… • Strong acids • Strong bases • Soluble ionic salts • Video: Electrolytes

  9. Example • Classify each of the following dissolved substances as a strong electrolyte, weak electrolyte, or nonelectrolyte: • CaCl2 • HNO3 • C2H5OH • HCOOH (formic acid) • KOH

  10. Example • Classify each of the following dissolved substances as a strong electrolyte, weak electrolyte, or nonelectrolyte: • CaCl2 – strong electrolyte • HNO3 – strong electrolyte • C2H5OH - nonelectrlyte • HCOOH (formic acid) – weak electrolyte • KOH – strong electrolyte

  11. HW: 4.12, 14, 16, 18Reading: 4.2-4.4 • This week: • Friday: Net Ionic Equations (4.2-4.4), Problem Set 4 Due

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