Example #3






Example #3

EXAMPLE 3 Predicting Precipitation Reactions:  Predict whether a precipitate will form when lead(II) nitrate, Pb(NO3)2(aq), and sodium acetate, NaC2H3O2(aq), are mixed.  If there is a precipitation reaction, write the complete and net ionic equations that describe the reaction.

Solution:

Step 1:  Determine the possible products using the general double displacement equation.  

AB  +  CD        AD  +  CB

The possible products from the mixture of Pb(NO3)2(aq) and NaC2H3O2(aq) are Pb(C2H3O2)2 and NaNO3.

          Pb(NO3)2(aq) + NaC2H3O2(aq)  to Pb(C2H3O2)2 and NaNO3

Step 2:    Predict whether either of the possible products is water insoluble.

According to our solubility guidelines, compounds with nitrates and acetates are soluble, so both Pb(C2H3O2)2 and NaNO3 are soluble. 

There is no precipitation reaction.

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