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Plan for Tues/Wed, 13/14 Oct 08

Turn in Exp 3 Pre-lab Today : Exp 3, Metathesis Reactions Purpose : To observe several metathesis reactions and develop a flow chart using solubility rules to identify an unknown solution. To write net ionic equations for the reactions observed.

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Plan for Tues/Wed, 13/14 Oct 08

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  1. Turn in Exp 3 Pre-lab Today: Exp 3, Metathesis Reactions Purpose: To observe several metathesis reactions and develop a flow chart using solubility rules to identify an unknown solution. To write net ionic equations for the reactions observed. To observe the physical state of several compounds. Turn in Exp 2 post-lab before you leave today Plan for Tues/Wed, 13/14 Oct 08

  2. Tips for success • Make sure your observations are very detailed!! • If no ppt forms in one of your tests on your unknown, make sure to perform the pH test…you may have NH4Cl. • You WILL NOT be given more of your unknown solution if you run out before you identify the cation and anion. • Avoid touching the AgNO3 solution. It will turn your skin black!! • HCl(aq) and NaOH(aq) are toxic and corrosive!! BE CAREFUL!! • NEVERput a spatula, etc into a reagent bottle. NEVER return unused reagent to the reagent bottle. Any unused reagent must be placed in the waste container. • DO NOToverfill the liquid waste containers. Let me know if they are getting too full and I will replace them.

  3. Part B: a) Draw flowchart that includes all possible tests. b) Draw flowchart for just the tests you performed.

  4. BaCl2.2H2O(s) AgNO3(aq) BaCl2(aq) + AgNO3(aq) Cl- NO3- Cl- NO3- Ba2+ Ag+ Ag+ Cl- Cl- Cl- Ba2+ Ag+ Ag+ NO3- Ba2+ Cl- NO3- Ba2+ Cl- Cl- 2AgNO3(aq) + BaCl2(aq)  2AgCl(s) + Ba(NO3)2(aq) Barium and nitrate ions are left in aqueous solution. Solid silver chloride precipitates out of solution.

  5. Total and Net Ionic Equations Conventional equation: a bookkeeping of all species present, and arranged for charge neutrality. BaCl2(aq) + 2AgNO3(aq) Ba(NO3)2(aq) + 2AgCl(s) Total Ionic equation: all aqueous species are split up into their component ions. Ba2+(aq) + 2Cl-(aq) + 2Ag+(aq) + 2NO3-(aq) 2AgCl(s) + Ba2+(aq)+ 2NO3-(aq) Na+ and NO3- are spectator ions in this reaction…they are not involved in the chemical change. Net Ionic equation: indicates exactly the chemical change that occurs, and nothing more. 2Ag+(aq) + 2Cl-(aq) AgCl(s)

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