Introduction 

Reaction between cations and anions will be examined in this lab. The resulting precipitate is indicative of the reaction that occured. 

In our lab a lead nitrate solution, Pb(NO3)2  will be mixed with a solution of potassium chromate, K2CrO4 , a yellow precipitate will forms. This precipitate must be a combination of : K+ or  Pb2+ cation and  CrO4 2- or NO3 2-  anion. Since most potassium salts and nitrates are soluble in water, PbCrO4 must be the precipitate. The equation for this reaction is:

Pb2+  +  CrO4 2-   ->  PbCrO4