Answer:The precipitate formed is calcium carbonate.
Explanation:
double replacement reaction is the chemical reaction in which two reactant exchanges their respective ions to give new substance as a product.
AB+CD→CB+AD
In a given reaction:
[tex]Ca(NO_3)_2(aq)+Na_2CO_3(aq)\rightarrow 2NaNO_3(aq)+CaCO_3(ppt)[/tex]
When calcium nitrate reacts with sodium carbonate in aqueous they give white colored precipitate of calcium sulfate and aqueous solution of sodium nitrate.