Question

Double displacement reaction are also known as precipjtation reactions. Why? Give an example.

Answer 1

Double displacement reactions are also known as precipitation reactions because they are accompanied by the formation of a precipitate.
e.g.:
BaCl2(aq)+PbSO4(aq)→BaSO4(s) +PbCl2(aq)

Answer 2

Concept

That reaction when two compounds react by ion exchange to form two new compounds is called double displacement reactions.

Explanation

A double displacement reaction is also known as precipitation reactions beacuse this is the that reaction occurs when the anions and cations switches between the two reactants so that it can form new products.

We can say that it is a chemical process that involves the exchange of bonds between two chemical reactions that lead to the creation of products with a similar or similar bond.

For example

NaCl + H2SO4 ---> NaHSO4 + HCl

Hence double displacement is also known a precipitation reaction

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