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Ion Exchange, Ionic Equations, Hydrolysis and Ion Tests

Chemistry Grade 9 Difficulty 3/5

Beginning of the lesson

Ion exchange forming a precipitate, spectator ions, neutralization and reversible hydrolysis

When ion-exchange reactions proceed

In aqueous solution, dissolved strong electrolytes exist mainly as ions. An exchange reaction has a clear driving force when ions form a precipitate, a gas, or a weakly ionized substance such as water. If all possible products remain soluble strong electrolytes, no net chemical change occurs.

Three equation levels

  1. Molecular: write compounds as formulas.
  2. Complete ionic: split soluble strong electrolytes into ions; keep solids, gases, water, and weak electrolytes intact.
  3. Net ionic: cancel unchanged spectator ions.

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  • Test questions: 15
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