Question
What do you understand by precipitation reaction? Explain with examples.
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Answer
When two ionic compound react and two ionic compounds (product) are formed of which one of the product is insoluble and settles as a solid, it is called a precipitate. Such reactions in which precipitate is formed are called precipitate reactions.
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.
$Na _2 SO _{4(\text { aq) }}+ BaCl _{2( aq )} \rightarrow \underset{\text { (White) }}{ BaSO _4 \downarrow}+2 NaCl _{\text {(aq) }}$
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.
$Na _2 SO _{4(\text { aq) }}+ BaCl _{2( aq )} \rightarrow \underset{\text { (White) }}{ BaSO _4 \downarrow}+2 NaCl _{\text {(aq) }}$
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