Question

why are some chemical reactions are characterized by the formation of precipitation
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Answer 1

Answer:

Some chemical reactions are characterized by the formation of precipitate. A precipitate is a 'solid product' which separates out from the solution during a chemical reaction. The chemical between potassium iodide and lead nitrate is characterized by the formation of a yellow precipitate of lead iodide.

Answer 2

Answer:

Precipitation

In such reactions, two different soluble salts (which are in aqueous solutions) combine to form two products. One of these products is insoluble in the solution and is precipitated out (and is, therefore, referred to as the 'precipitate').