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What do you understand by precipitation ...

What do you understand by precipitation reaction? Explain with examples.

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(i) When two ionic compounds react and two ionic compounds (product) are formed of which one product is insoluble and settles as a solid , it is called a precipitate.
(ii)Such reactions in which precipitate is formed are called precipitation reactions.
(iii) Example: When aqueous solution of Sodium Sulphate is mixed with the aqueous solution of Barium Chloride, it forms Barium Sulphate in the form of white precipitate.
`Na_(2) SO_(4(aq))+underset(("White"))(BaSO_(4))darr+2NaCl_((aq))`
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