Tuesday, May 19, 2009

What is the word equation for the precipitation of lead iodide?

Lead iodide precipitate can be produced by reacting potassium iodide (`KI` ) with lead II nitrate (`~Pb(NO_3)_2` ). The chemical equation for this reaction is:


   `~2KI` + `~Pb(NO_3)_2` -> `~PbI_2` + `~2KNO_3`


This is a double replacement reaction that results in the formation of a precipitate. This type of reaction can also be called a precipitation reaction. 


The solubility of a substance can be determined by looking at a list of solubility rules. A list of solubility rules can be found in your textbook or online. The solubility rules tell us that `~PbI_2` is insoluble and will form a solid precipitate. 


Therefore, the word equation for this reaction would be:


Aqueous potassium iodide reacts with aqueous lead II nitrate to produce solid lead II iodide and aqueous potassium nitrate.

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