Precipitation reactions - solutions

Aim - To observe a number of precipitation reactions and write the overall equation for each reaction.

Procedure- Mix 0.1M solutions of each of the following pair of compounds. Record your prediction of what the preicipitate will be (give the name of the precipitate and its formula). Write the overall equation for each reaction.

Compounds
Prediction
Lead nitrate and sodium carbonate
The overall equation = Pb(NO3)2(aq) + Na2CO3(aq) -> PbCO3(s) + 2NaNO3(aq)
Lead nitrate and Potassium iodide
The overall equation = Pb(NO3)2(aq) + 2KI(aq) -> PbI2(s) + 2KNO3(aq)
Silver nitrate and potassium iodide
The overall equation = AgNO3(aq) + KI(aq) -> AgI(s) + KNO3(aq)
Lead nitrate and potassium dichromate
The overall equation = Pb(NO3)2(aq) + K2Cr2O7(aq) -> PbCr2O7(s) + 2KNO3(aq)

Copper sulfate and barium chloride
The overall equation = CuSO4(aq) + BaCl2(aq) -> BaSO4(s) + CuCl2(aq)
Copper sulfate and sodium carbonate
The overall equation = CuSO4(aq) + Na2CO3(aq) -> Na2SO4(aq) + CuCO3(s)
Sodium chloride and silver nitrate
The overall equation = AgNO3(aq) + NaCl(aq) -> AgCl(s) + NaCl(aq)
Copper sulfate and lead nitrate
The overall equation = CuSO4(aq) + Pb(NO3)2 (aq) -> PbSO4(s) + Cu(NO3)2(aq)
Sodium carbonate and potassium iodide  
The overall equation = no precipitate is formed)
Silver nitrate and potassium dichromate
The overall equation = K2Cr2O7(aq) + 2AgNO3(aq) -> Ag2Cr2O7(s) + 2KNO3(aq)

As an extension activity write the ionic equation for each precipitation reaction above. First ask your teacher if you should attempt this and then fill in the table below.
Compounds
Prediction
Lead nitrate and sodium carbonate Precipitate will form
The ionic equation =Pb2+ (aq) + CO32-(aq) -> PbCO3(s)
Lead nitrate and Potassium iodide Precipitate will form
The ionic equation =Pb2+ (aq) + 2I-(aq) -> PbI2(s)
Silver nitrate and potassium iodide Precipitate will form
The ionic equation = l-(aq) + Ag+(aq) -> Agl(s)
Lead nitrate and potassium dichromate Precipitate will form
The ionic equation =Pb2+ (aq) + Cr2O72-(aq) -> PbCr2O7(s)

Copper sulfate and barium chloride

 Precipitate will form
The ionic equation =Ba2+(aq) + SO42-(aq) -> BaSO4(s)
Copper sulfate and sodium carbonate Precipitate will form
The ionic equation =Cu2+(aq) + CO32-(aq) -> CuCO3(s)
Sodium chloride and silver nitrate Precipitate will form
The ionic equation =Cl-(aq) + Ag+(aq) -> AgCl(s)
Copper sulfate and lead nitrate Precipitate will form
The ionic equation = SO42-(aq) + Pb2+(aq) -> PbSO4(s)
Sodium carbonate and potassium iodide No precipitate
The ionic equation = Nil
Silver nitrate and potassium chromate Precipitate will form
The ionic equation = Cr2O72-(aq) + 2Ag+(aq) -> Ag2Cr2O7(s)