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.

  • Chemical reaction between Na2S and HCl.

Here Na and H are positive ions i.e. Na+ and H+, whereas S and Cl are negative ions S2- and Cl-. Hence,

 

  • Reaction of sodium sulphate solution with barium chloride solution.

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.

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