Question

hen aqueous solutions of calcium bromide and sodium carbonate are combined, solid calcium carbonate and a solution of sodium bromide are formed. The net ionic equation for this reaction is:

Answer 1

Answer:

$Ca^{2+}(aq)+CO_3^{2-}(aq)\rightarrow CaCO_3 (s)$

Explanation:

Hello.

In this case, we can first write the complete molecular equation as shown below:

$CaBr_2(aq)+Na_2CO_3\rightarrow CaCO_3 (s) +2NaBr(aq)$

In such a way, since all the species but calcium carbonate remain in aqueous solution, they are successfully dissociated whereas the solid product remain undissociated:

$Ca^{2+}(aq)+2Br^-(aq)+2Na^+(aq)+CO_3^{2-}(aq)\rightarrow CaCO_3 (s) +2Na^+(aq)+2Br^-(aq)$

Thus, we can cancel out bromide and sodium ions as spectator ions, in order to obtain the required net ionic equation:

$Ca^{2+}(aq)+CO_3^{2-}(aq)\rightarrow CaCO_3 (s)$

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