2. Chemical Equations Molecular, Total Ionic & Net Ionic Equations

3. Chemical Reactions: Keeping Track: Precipitation Reactions Sodium Carbonate Calcium Chloride Calcium Carbonate Sodium Chloride Na 2 CO 3(aq) + CaCl 2(aq)  CaCO 3(s) + 2 NaCl (aq) Molecular Equation Total Ionic Equation Na + (aq) + Na + (aq) + CO 3(aq) + Ca 2+ (aq) + 2 Cl - (aq) + 2 Na + (aq) + 2 Cl - (aq)  CaCO 3(s) Net Ionic Equation + CO 3(aq) Ca 2+ (aq)  CaCO 3(s) Spectator ions: Present but not changed during the reaction. Spectator ions removed. Were the spectator ions REALLY necessary??? Yes, they were originally partnered with the carbonate and calcium ions.

4. Chemical Reactions: Keeping Track: Neutralization Reactions H 2 SO 4(aq) + 2 NaOH (aq)  2 H 2 O (L) + Na 2 SO 4(aq) Sulfuric Acid Sodium Hydroxide LIQUID water Sodium Sulfate Molecular Equation Total Ionic Equation H + (aq) + H + (aq) + SO 2- 4(aq) + 2 Na + (aq) + 2 OH - (aq) + 2 Na + (aq) + SO 4 2- (aq)  2 H 2 O (L) Net Ionic Equation + 2 OH - (aq) 2 H + (aq)  2 H 2 O (L) Spectator ions: Present but not changed during the reaction. Spectator ions removed. H + (aq)  H 2 O (L) + OH - (aq)...for many common acid/base reactions

5. Problem Aqueous barium hydroxide and sulfuric acid solutions are mixed together. a. What products are formed? b. What are the molecular, total ionic and net ionic reactions?

6. Problem Aqueous barium hydroxide and sulfuric acid solutions are mixed together. a. What products are formed? b. What are the molecular, total ionic and net ionic reactions? Ba(OH) 2(aq) H 2 SO 4(aq) Ba 2+ (aq) OH - (aq) H + (aq) SO 4 2- (aq) BaSO 4(s) H 2 O (L)

7. Equations: Molecular Equation: Ba(OH) 2(aq) + H 2 SO 4(aq)  2 H 2 O (L) + BaSO 4(s) Total Ionic Equation: Ba 2+ (aq) + 2 OH - (aq) + 2 H + (aq) + SO 4 2- (aq)  2 H 2 O (L) + BaSO 4(s) Net Ionic Equation: NO Spectator ions! Ba 2+ (aq) + 2 OH - (aq) + 2 H + (aq) + SO 4 2- (aq)  2 H 2 O (L) + BaSO 4(s)