What is a double displacement reaction?

A double-replacement reaction is a reaction in which the cations and anions of two ionic compounds exchange places to form two new compounds.

The general form of a double-replacement (also called double-displacement) reaction is: AB + CD → AD + BC.

Eg: Pb(NO₃)₂ (aq) + 2KI (aq) → 2 KNO₃ (aq) + PbI₂ (s), in this case, a precipitate of lead (II) iodide is formed.

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Updated on: 10-Oct-2022

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