Question

Write a net ionic equation for the reaction that occurs when excess aqueous hydrobromic acid is combined with solid magnesium carbonate.

Answer 1

molecular equation is as follows

MgCO3(s) + 2 HBr(aq) --> MgBr2(aq) +CO2(g) + H2O(l)

now spilt species in aqueous form to ins we get
compete ionic equation:

MgCO3(s) +2H+(aq) + 2Br-(aq) --> Mg2+(aq) +2Br-(aq) +CO2(g) + H2O(l)

NOTE-: since MgCO3 in solid form it will not ionize

Now we have to cancel spectator ions [common ions found in reactant and product side]
Br- is the spectator ion ,thus we get

Net ionic equation

MgCO3(s) +2H+(aq) --> Mg2+(aq) +CO2(g) + H2O(l)
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