What do you mean by a precipitation reactions?
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the reaction in which the precipitate is formed is called precipitation reaction e.g
BaCl2 + NaI------------ BaI2 + NaCl2
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Precipitation reactions occur when cations and anions in aqueous solution combine to form an insoluble ionic solid called a precipitate. A precipitate is a solid that forms out of solution.
A common example is that of the mixing of two clear solutions: Silver nitrate (AgNO3) and sodium chloride (NaCl):
AgNO3(aq)+NaCl(aq)→AgCl(s)↓+NaNO3(aq)
The precipitate forms because the solid (AgCl) is insoluble in water.
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