Double Displacement Reaction

In a chemical double displacement reaction two compounds swap ions, effectively displacing each other to form two new compounds (aka double replacement reaction). For example:
2 NaCl(aq) + CuSO4(aq)Na2SO4(aq) + CuCl2(solid)
CaCl2(aq) + 2 AgNO3(aq) ⇒ Ca(NO3)2(aq) + 2 AgCl(solid)
One of the compounds formed is usually a precipitate, an insoluble gas that bubbles out of the solution, or a molecular compound, usually water. A neutralization reaction is a specific type of double displacement reaction. Neutralization occurs when equal amounts of acid react with equal amounts of a base. A neutralization reaction creates a solution of salt and water. E.g.:
HCl(aq) + NaOH(aq)NaCl(aq) + H2O(liquid)

 

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