Precipitation reactions is the formation of a solid salt when two solutions containing soluble salts are combined. Whether or not a reaction occurs can be determined using the solubility rules for ionic solids. Because not all reactions form a precipitate, you have to use the solubility rules to tell if the substance created is a insoluble salt.
https://www.youtube.com/watch?v=WPnrMTCK0aU
When looking at these reactions they can be seen in the molecular equation, complete equation, and net ionic equation as it goes through the reaction.
http://www.slideshare.net/colinquinton/04-3144335
If you want to know more about precipitation reactions you can visit these sites
http://chemwiki.ucdavis.edu/Inorganic_Chemistry/Reactions_in_Aqueous_Solutions/Precipitation_Reactions
https://www.youtube.com/watch?v=IIu16dy3ThI
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