Question

what is precipitation reaction
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Answer 1

Answer:

Precipitation reactions occur when cations and anions in aqueous solution combine to form an insoluble ionic solid called a precipitate. Whether or not such a reaction occurs can be determined by using the solubility rules for common ionic solids.

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Answer 2

Answer:

Reaction in which insoluble solid (salts) are formed.Precipitation reactions are usually double displacement reactions involving the production of a solid form residue called the precipitate.

for example:

Reaction of copper sulphate with sodium hydroxide results in formation of precipitate.

$CuSO_4 + 2NaOH \rightarrow Na_2SO_4+ Cu(OH)_2 \darr$

Here down Arrow represent precipitate