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Double Replacement Reaction Definition


Definition: A double replacement reaction is a chemical reaction where two reactant ionic compounds exchange ions to form two new product compounds with the same ions.

Double replacement reactions take the form:

A+B- + C+D- → A+D- + C+B-
The reaction

AgNO3 + NaCl → AgCl + NaNO3

is a double replacement reaction. The silver traded its nitrite ion for the sodium's chloride ion.

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