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Importance of Net Ionic Equations in Chemistry

Understand the significance of net ionic equations in depicting reactions involving precipitates and spectator ions. Learn to assign charges, dissociate aqueous species, and identify and eliminate spectator ions. Practice balancing equations for a clear understanding.

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Importance of Net Ionic Equations in Chemistry

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  1. What is the importance of expressing a net ionic equation?

  2. What is a NET IONIC EQN? • The dictionary definition is:Chemical equation for a reaction which lists only those species participating in the reaction.MY definition is:An equation that shows only the reactants involved in the formation of a precipitate.

  3. Key Terminology • Net Ionic Equations : include ions that dissociate an aqueous solution, only those involved in the formation of a precipitate • Precipitate = solid product that does not break apart • Spectator Ion = ion that does not take part in the reaction

  4. Watch This! • http://www.crescent.edu.sg/crezlab/webpages/PptReaction_AgCl.htm Ppt  Ppt

  5. Let’s Look at an Example! +1 +1 -1 -1 -1 AgNO3(aq) + KCl(aq) AgCl(s) + KNO3(aq) • Assign Charges to all species. +1 +1 -1

  6. +1 -1 +1 -1 +1 -1 +1 -1 AgNO3(aq) + KCl(aq) AgCl(s) + KNO3(aq) Ag +1 NO3-1 +K+1 Cl-1  AgCl (s) + K+1 NO3-1 • Assign Charges to all species. • Dissociate all (aq) species – SLOSHERS! • SOLIDS STAY (s) – do not dissociate.

  7. AgNO3(aq) + KCl(aq) AgCl(s) + KNO3(aq) Ag +1 +NO3-1 +K+1 + Cl-1  AgCl (s) + K+1 + NO3-1 • Assign Charges to all species. • Dissociate all (aq) species – SLOSHERS! • SOLIDS STAY (s) – do not dissociate. • Cross out spectators. Cross out spectators because they do not take place in the reaction. They are still floating around in the solution.

  8. AgNO3(aq) + KCl(aq) AgCl(s) + KNO3(aq) Ag +1 +NO3-1 +K+1 + Cl-1  AgCl (s) + K+1 + NO3-1 Ag +1 + Cl-1  AgCl (s) • Assign Charges to all species. • Dissociate all (aq) species – SLOSHERS! • SOLIDS STAY (s) – do not dissociate. • Cross out spectators. • Rewrite remaining. • Balance.

  9. Try one! Pb(NO3)2(aq) + AlCl3(aq)  Cu(SO4) (aq) + Cal2(aq) 

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