ioniccpds2_su08 - Revised1/08,RJE IonicCompounds#2...

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Cl - Cl - + Ag + Ag + Ag + Ag + NO 3 - NO 3 - NO 3 - NO 3 - Na + Na + Cl - Cl - Na + Na + Ag + Cl - Cl - Ag + Ag + Cl - Cl - Ag + Na + Na + Na + Na + NO 3 - NO 3 - NO 3 - NO 3 - Revised 1/08, RJE Ionic Compounds #2 Precipitation The goal of this experiment is to help students understand precipitation reactions involving ionic  compounds. OBJECTIVES 1. Predict if a precipitate will form when two ionic solutions are mixed. 2. Write total and net ionic equations for precipitation reactions.  3. Explain what is happening (including chemical reactions) during a conductimetric  precipitation titration. I.  PRECIPITATION REACTIONS An ionic precipitation reaction occurs when two ionic solutions are mixed and one of the  combinations of ions in the new solution creates an insoluble compound, which forms a solid in  the solution.  A solution in which a precipitation reaction occurs looks cloudy, may be white or  colored, and if left still, the precipitate typically settles to the bottom. You can predict if a precipitate will form when two ionic solutions are mixed by looking at all the new, possible combinations of cations and anions and  identifying if any produce insoluble compounds.  If you mix NaCl and AgNO 3 , the new possible  combinations are NaNO 3  and AgCl.  NaNO 3  is soluble, but AgCl is insoluble, so you would  predict that AgCl would precipitate. In this section you will be asked to find two pairs of ionic solutions the WILL form a precipitate  when mixed and two pairs of ionic solutions that WILL NOT form a precipitate when mixed.   You will then confirm or refute your predictions by mixing the solutions and observing what  happens. Ionic #2-1
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PROCEDURE 1. Select two pairs of solutions that you think WILL form a precipitate and two pairs that WILL NOT form a precipitate when mixed. Use your Empirical Solubility Table from Ionic #1 and  a list of Lab Reagents.  Avoid solutions of hydroxides, which tend to produce unexpected  results.    WILL Precipitate Solution #1 Solution #2 Formula of Precipitate Observations WILL NOT Precipitate 2. Obtain 3 mL of each solution in each of the tables.  Mix the pairs of solutions one at a time in a test tube and record your observations in the tables above. Ionic #2-2 Solution #1 Solution #2 Observations
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II. IONIC REACTIONS AND IONIC EQUATIONS Equations for chemical reactions involving ionic compounds are sometimes written with  compound or molecular formulas, called  a   molecular equation : NaCl(aq) +  AgNO 3  (aq)   AgCl(s) +   NaNO 3  (aq) Your study of the chemical behavior of ionic compounds, as well as the data on electrical conductivity indicated that the aqueous solutions consist of individual ions.  We may 
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