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Net Ionic Equations

Net Ionic Equations. Net Ionic Equations…. …describe a chemical reaction in solution recognizing the role of dissociation. 3 steps. Non Ionic equation (aka balanced chemical equation) Total ionic equation Net ionic equation. Example.

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Net Ionic Equations

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  1. Net Ionic Equations

  2. Net Ionic Equations… • …describe a chemical reaction in solution recognizing the role of dissociation.

  3. 3 steps • Non Ionic equation (aka balanced chemical equation) • Total ionic equation • Net ionic equation

  4. Example • Solutions of lead (II) nitrate and potassium iodide are mixed.

  5. Non ionic equation Pb(NO3)2 + KI ---> (aq) 2 (aq) PbI2 + KNO3 (s) 2 (aq)

  6. Total ionic equation • Dissociate or ionize everything that is: • Aqueous and ionic • Aqueous and acid

  7. Pb(NO3)2 + KI ---> (aq) 2 (aq) PbI2 + KNO3 (s) 2 (aq) NOT aqueous so not dissociated Total ionic Dissociate Pb2+(aq) + 2NO3¯(aq) + 2K+(aq) + 2I¯(aq) ---> PbI2(s) + 2K+(aq) + 2NO3¯(aq)

  8. Spectator species (entities) • A spectator species is a species (entity) that does not change in the reaction, is not involved in the reaction.

  9. Cancel spectator species Total ionic equation: Pb2+(aq) + 2NO3¯(aq) + 2K+(aq) + 2I¯(aq) ---> PbI2(s) + 2K+(aq) + 2NO3¯(aq) What remains is the net ionic equation.

  10. Net ionic equation Pb2+(aq) + 2I¯(aq) ---> PbI2(s)

  11. Example Chlorine gas is bubbled through a solution of sodium fluoride. Non ionic equation: Cl2(g) + 2NaF(aq) ---> F2(g) + 2NaCl(aq)

  12. Total ionic equation Dissociate everything that is: Aqueous and ionic or aqueous and acid Cl2(g) + 2NaF(aq) ---> F2(g) + 2NaCl(aq) Cl2(g) + 2Na+(aq) + 2F¯(aq) ---> F2(g) + 2Na+(aq) + 2Cl¯(aq)

  13. Cl2(g) + 2Na+(aq) + 2F¯(aq) ---> F2(g) + 2Na+(aq) + 2Cl¯(aq) Net Ionic Equation Cancel all spectator species: What remains is the net ionic equation: Cl2(g) + 2F¯(aq) ---> F2(g) + 2Cl¯(aq)

  14. Watch for: • Occasionally there are no spectator species. Then the total and the net are the same. • Occasionally all species in the total ionic equation are spectators, everything cancels. What does this mean??

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