|Class 10 Chemistry Chemical Reactions and Equations||Double displacement reaction|
Double displacement reaction
A reaction involving the exchange of ions between the reactants is termed as Double displacement reaction.
Consider the following double displacement reaction.
Here Na and H are positive ions i.e. Na+ and H+, whereas S and Cl are negative ions S2- and Cl-. Hence,
The reaction involves formation of precipitation. The white precipitate of BaSO4 is formed by the
reaction of SO42- and Ba2+. This type of reaction that involves formation of precipitation are called precipitation reaction.