Here's why:
* Double displacement reactions involve the exchange of ions between two reactants. In this case, the sodium ions (Na⁺) from sodium carbonate and the calcium ions (Ca²⁺) from calcium chloride swap places.
* The products of this reaction are:
* Calcium carbonate (CaCO₃), which is a white solid that is insoluble in water and often precipitates out of solution.
* Sodium chloride (NaCl), which is a soluble salt that remains dissolved in the solution.
The balanced chemical equation for the reaction is:
Na₂CO₃(aq) + CaCl₂(aq) → CaCO₃(s) + 2NaCl(aq)
Key Observations:
* The reaction often results in the formation of a precipitate (calcium carbonate), which can be observed as a white solid settling out of the solution.
* The reaction is driven by the formation of the insoluble calcium carbonate.
* This reaction is a common example of a precipitation reaction.
