Double Displacement Reaction
A double displacement reaction is a reaction in which two compounds exchange ions to form two new compounds.
Practice This ConceptMain explanation
Teacher explanation
This reaction usually happens in aqueous solution. The ions swap partners, and sometimes one product is an insoluble solid. That is why many precipitation reactions are double displacement reactions.
Example
Sodium sulphate solution and barium chloride solution form barium sulphate and sodium chloride.
Simple analogy
Two compounds swap partners.
Common confusion
Students may think only one substance changes. In fact, both compounds exchange ions.
Exam tip
If two solutions are mixed and ions swap partners, check whether a precipitate forms.
Answer writing and exam use
1-mark use
Write the exact meaning of double displacement reaction in one clean line.
2-mark use
Define double displacement reaction and add one example or condition.
3-mark use
Explain double displacement reaction, show the method or example, and mention the common mistake.
Practice this concept with focused MCQs
Open the concept quiz intro first, review the test details, and then start a focused MCQ set from this concept only. Instant score and answer review are live now.
Help improve this page
Found something confusing, incorrect, or missing?