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:

Explanation:

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

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:

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

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