Lab Activity In your composition book on the next clean page: Title- Electrolyte and Non Electrolyte Nov 4, 2013 Make a data table like the one on the following slide. Copyright McGraw-Hill 20091

Data Table SubstanceFormulaLight on or off ElectrolyteNon Electrolyte Tap water Distilled water Salt water Sugar water Hydrochloric acid Sodium Hydroxide Acetic Acid Ammonia Copyright McGraw-Hill 20092

Solutions Electrolytes and Non Electrolytes Copyright McGraw-Hill 20093

4 Electrolytes and Nonelectrolytes –Electrolyte: substance that dissolved in water produces a solution that conducts electricity Contains ions –Nonelectrolyte: substance that dissolved in water produces a solution that does not conduct electricity Does not contain ions

Copyright McGraw-Hill Dissociation - ionic compounds separate into constituent ions when dissolved in solution Ionization - formation of ions by molecular compounds when dissolved

Copyright McGraw-Hill Strong and weak electrolytes –Strong Electrolyte: 100% dissociation All water soluble ionic compounds, strong acids and strong bases –Weak electrolytes Partially ionized in solution Exist mostly as the molecular form in solution Weak acids and weak bases

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8 Examples of weak electrolytes –Weak acids HC 2 H 3 O 2(aq) C 2 H 3 O 2  (aq) + H + (aq)‏ –Weak bases NH 3 (aq) + H 2 O (l) NH 4 + (aq) + OH  (aq) (Note: double arrows indicate a reaction that occurs in both directions - a state of dynamic equilibrium exists)

Copyright McGraw-Hill Method to Distinguish Types of Electrolytes nonelectrolyteweak electrolytestrong electrolyte

Copyright McGraw-Hill Classify the following as nonelectrolyte, weak electrolyte or strong electrolyte –NaOH strong electrolyte –CH 3 OH nonelectrolyte –H 2 CO 3 weak electrolyte