what do you mean by precipitation reaction explain by giving examples.
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The reactions in which a precipitate is formed are called precipitation reactions. Examples:
1. Na2SO4 + BaCl2 —> BaSO4 + 2NaCl
In this reaction, BaSO4 is obtained as precipitate.
2. Na2CO3 + CaCl2 —> CaCO3 + 2NaCl
Here calcium carbonate is obtained as precipitate.
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1. Na2SO4 + BaCl2 —> BaSO4 + 2NaCl
In this reaction, BaSO4 is obtained as precipitate.
2. Na2CO3 + CaCl2 —> CaCO3 + 2NaCl
Here calcium carbonate is obtained as precipitate.
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Those reactions in which two compounds react to form insoluble compound, which is called precipitate, are called precipitation reaction. E.g.
When solutions of silver nitrate and sodium chloride are mixed, white precipitate of silver chloride is formed.
AgNO3(aq) +NaCl (aq) --> AgCl (s) + NaNO3 (aq)
On adding dilute HCl to the aqueous solution of lead nitrate, precipitate of lead chloride is formed.
Pb(NO3)2 (aq) +2HCl --> PbCl2 (s) +2HNO3 (aq)
When solutions of silver nitrate and sodium chloride are mixed, white precipitate of silver chloride is formed.
AgNO3(aq) +NaCl (aq) --> AgCl (s) + NaNO3 (aq)
On adding dilute HCl to the aqueous solution of lead nitrate, precipitate of lead chloride is formed.
Pb(NO3)2 (aq) +2HCl --> PbCl2 (s) +2HNO3 (aq)
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