Precipitation Reactions Worksheet - Answer Key

 

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  1. What occurs in a precipitation reaction?

    An insoluble solid forms after mixing solutions together that contained soluble aqueous salts.

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  2. Consider:

    Na2SO4 (aq) + Pb(NO3)2 (aq)    →

      3.  

    • What are the three types of reaction equations that can be used to describe this reaction?
      • Molecular Equation
        Na2SO4 (aq) + Pb(NO3)2        → PbSO4 (s) + 2 NaNO3 (aq)
      • Total Ionic Equation
        2Na+(aq) + SO42-(aq) + Pb2+(aq) + 2NO3-(aq)→
        PbSO4 (s) + 2 Na+(aq) + 2 NO3-(aq)
      • Net Ionic Equation
        Pb2+(aq) + SO42-(aq)→ PbSO4 (s)
    • What products, if any, form?

      PbSO4 (s) formed – once again this is determined by looking at the rules of solubility.

     

     

  3. Consider the reaction between silver nitrate and calcium chloride
    • How many grams of silver chloride can be prepared by the reaction of 100.0 mL of 0.20M silver nitrate with 100.0 mL of 0.15 M calcium chloride?

      2.9 g AgCl

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    • Calculate the concentration, in M, for each of the ions remaining in sol’n after reaction has gone to completion.

      [Ag+] = 0
      [NO3-] = 0.10 M
      [Ca2+] = 0.075 M
      [Cl-] = 0.050 M            

     

     

  4. What volume of 0.900M Na3PO4 is required to precipitate all the lead (II) ions from 160.0 mL of 0.650M Pb(NO3)2?

    77.0 mL Na3PO4

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