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PrecipitateA precipitate is a solid that is formed during a chemical reaction.Precipitate formation is useful in detecting the type of cation in an unknown salt. To do this, an alkali first reacts with the unknown salt to produce a precipitate which is the hydroxide of the unknown salt. To identify the cation, the colour of the precipitate and its solubility in excess are noted. 
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Precipitate".