Lecture 10/18/99 Chapter 5, Section 1-2

Announcements

  1. Chapter 5 Assignment: Due Monday 10/25/99 5:00 pm Chapter 5 Homework Set and Questions: 8,22,30,36,44,54,58,60,72,74,82,106,112

Reactions in Solution

  1. Ions in Solution
    1. Structure of Ionic Compounds (overhead fig 3.13)
    2. Solvation of Ionic Compounds (overhead fig 3.15)
    3. KMnO4 (CD-ROM d: h: Internet)
    4. Strong and Weak Acids & Bases, CD-ROM 4-7 & 4-8 (overhead table 4.1)
  2. Precipitation Reactions (Names, Equation, Balance, Net Ionic Equation)
    1. potassium chromate and lead nitrate produces lead chromate and potassium nitrate(CD-ROM d: h: Internet) )
      K2CrO4 (aq) + Pb(NO3)2 (aq) - > PbCrO4 (s) + 2 KNO3 (aq)
    2. lead nitrate and potassium iodide produces lead iodide and potassium nitrate(CD-ROM d: h: Internet)
      Pb(NO3)2 (aq) + 2 KI (aq) -> PbI2 (s) + 2 KNO3 (aq)
    3. silver nitrate and sodium chloride produces silver chlroide and sodium nitrate(CD-ROM d: h: Internet)
      AgNO3 (aq) + NaCl aq) - > AgCl (s) + NaNO3 (aq)
    4. iron (III) Ions + Sodium hydroxide produces iron (iii) hydroxide and sodium ions(CD-ROM d: h: Internet)
      Fe3+ (aq) + 3 NaOH (aq) - > Fe(OH)3 (s) + 3 Na1+(aq)
    5. Solubility Rules (Overhead)
  3. Stoichiometry 4.5698 g of lead nitrate is dissolved in 250.0 mL of water. How many moles of Pb2+ and NO31- are produced?
      Pb(NO3)2 -> Pb2+ 2 NO31-
    given 4.5698 g      
    MW 331.21 g mole-1      
    give 0.013797 mole      
    In solution     0.013797 mole 0.027595 mole
  4. 1.4578 g potassium chloride is dissolved in 150.0 mL of water. How many moles of of K+ and Cl1- are produced?
      KCl -> K1+ Cl1-
    given 1.4578 g      
    MW 74.551 g mole-1      
    given 0.019554 mole      
    In solution     0.019554 mole 0.019554 mole
  5. After the solutions are mixed, what is the mass of any precipitate.
      Pb2+(aq) 2 NO31-(aq) 2 K1+(aq) 2 Cl1-(aq) -> PbCl2(s) 2 K1+(aq) 2 NO31-(aq)
    start (mole) 0.013797 0.027595 0.019554 0.019554        
    use (mole) 0.009777 spectator spectator 0.019554        
    produce (mole)           0.009777 spectator spectator
    Final (mole) 0.004020         0.009777 0.027595 0.019554
    MW           278.9 g/mole    
    Mass           2.721 g