What is a Double Displacement Reaction?

AI Thread Summary
A double displacement reaction, also known as a double replacement reaction, occurs when two compounds exchange ions or molecules to form two new compounds. This type of reaction typically takes place in aqueous solutions and can result in the formation of a precipitate, a gas, or water. The example provided in the discussion illustrates this concept: when sodium carbonate reacts with nitric acid, a gas is produced, demonstrating the exchange of components between the reactants. The confusion may stem from the overlap with precipitation and gas-evolution reactions, but the key characteristic of double displacement is the swapping of ions between the reacting compounds. Understanding this definition clarifies the nature of double displacement reactions in chemistry.
Bashyboy
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What exactly is a double displacement reaction? I searched my textbook for the term--yes, I did check the glossary first--and it proved futile. My teacher alludes to this term and even has one power point slide to it. It says, "When an aqueous solution of sodium carbonate is added to an aqueous solution of nitric acid, a gas evolves." And that is all he has pertaining to double displacement reactions. Now, I did come across precipitation and gas-evolution reactions, and they appear to be similar. Could someone give me a good definition of this sort of reaction?

Thank you
 
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