Net Ionic Equations.

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Presentation transcript:

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

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

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

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

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

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.

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

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

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)

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

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??