Lesson 4, Topic 4
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# Precipitation

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Precipitation uses the properties of solubilities of different solvents. For example, if two ions copper (II) ions and silver ions are present in an aqueous medium. One can be precipitated out on the addition of a solvent in which it is not soluble. When dilute hydrochloric acid is added to the above solution, silver ions are precipitated as silver chloride while copper (II) ions remain in the solution.

Ag+(aq) + Cu2+(aq) + Cl(aq) $$\scriptsize \rightarrow$$ AgCl(s) + Cu2+(aq)

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