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  • 1. Chemical Reactions: Precipitation Lecture 11
  • 2. Precipitation everywhere.
  • 3. Precipitation in oceans:
  • 4. Precipitation in rivers
  • 5. Precipitation in laboratories
  • 6. In precipitation reactions, two soluble ionic compounds react to form an insoluble product, a precipitate.
  • 7. Precipitates form because the electrostatic attraction between the ions outweighs the tendency of the ions to remain solvated and move randomly throughout the solution.
  • 8. The reaction of Pb(NO 3 ) 2 and NaI Copyright ©The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
  • 9. The reaction between Pb(NO 3 ) 2 and NaI
  • 10. A precipitation reaction is the formation of an insoluble product through the net removal of solvated ions from solution.
  • 11. The reaction of PbCl 2 and Na 2 SO 4 Copyright ©The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
  • 12. How the precipitate was formed:
    • Molecular: PbCl 2 (aq) + Na 2 SO 4 (aq)  PbSO 4(s) + 2NaCl (aq)
    • Total ionic: Pb 2+ (aq) + 2Cl - (aq) + 2Na + (aq) + SO 2- 4 (aq)  PbSO 4(s) + 2Na + (aq) + 2Cl - (aq)
    • Net ionic: Pb 2+ (aq) + SO 2- 4 (aq)  PbSO 4(s)
  • 13.  
  • 14. Solubility chart
  • 15. A sample problem on predicting whether a precipitation reaction occurs.
  • 16. BaSO 4 precipitated
  • 17. How BaSO 4 could be formed:
    • Molecular: BaCl 2 (aq) + FeSO 4 (aq)  BaSO 4(s) + FeCl 2(aq)
    • Total ionic: Ba 2+ (aq) + 2Cl - (aq) + Fe 2+ (aq) + SO 2- 4 (aq)  BaSO 4(s) + Fe 2+ (aq) + 2Cl - (aq)
    • Net ionic: Ba 2+ (aq) + SO 2- 4 (aq)  BaSO 4(s)
  • 18. Precipitation reactions are double-displacement reactions, also called double-replacement and metathesis reactions. The ions are exchanging partners.
  • 19. Precipitation theme is popular ;-)
  • 20. THE END