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Lecture11221
 

Lecture11221

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a supplemental resource for students

a supplemental resource for students

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    Lecture11221 Lecture11221 Presentation Transcript

    • Chemical Reactions: Precipitation Lecture 11
    • Precipitation everywhere.
    • Precipitation in oceans:
    • Precipitation in rivers
    • Precipitation in laboratories
    • In precipitation reactions, two soluble ionic compounds react to form an insoluble product, a precipitate.
    • Precipitates form because the electrostatic attraction between the ions outweighs the tendency of the ions to remain solvated and move randomly throughout the solution.
    • The reaction of Pb(NO 3 ) 2 and NaI Copyright ©The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
    • The reaction between Pb(NO 3 ) 2 and NaI
    • A precipitation reaction is the formation of an insoluble product through the net removal of solvated ions from solution.
    • The reaction of PbCl 2 and Na 2 SO 4 Copyright ©The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
    • 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)
    •  
    • Solubility chart
    • A sample problem on predicting whether a precipitation reaction occurs.
    • BaSO 4 precipitated
    • 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)
    • Precipitation reactions are double-displacement reactions, also called double-replacement and metathesis reactions. The ions are exchanging partners.
    • Precipitation theme is popular ;-)
    • THE END