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

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Presentation on theme: "Net Ionic Equations. Net Ionic Equations… …describe a chemical reaction in solution recognizing the role of dissociation."— Presentation transcript:

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(NO 3 ) 2 + KI --->PbI 2 + KNO 3 22(aq) (s)

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

7 Total ionic Pb(NO 3 ) 2 + KI --->PbI 2 + KNO 3 22(aq) (s) Dissociate Pb 2+ (aq) + 2NO 3 ¯(aq) +2K + (aq) + 2I¯(aq) ---> PbI 2 (s) +2K + (aq) + 2NO 3 ¯(aq) NOT aqueous so not dissociated

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 Pb 2+ (aq) + 2NO 3 ¯(aq) +2K + (aq) + 2I¯(aq) ---> PbI 2 (s) +2K + (aq) + 2NO 3 ¯(aq) What remains is the net ionic equation. Total ionic equation:

10 Net ionic equation Pb 2+ (aq) + 2I¯(aq) ---> PbI 2 (s)

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

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

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