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# Full Ionic Equation? Nitric acid and calcium carbonate

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1. Hey! I'm having some problems with writing the full ionic equation of the reaction between calcium carbonate and nitric acid.

I understand that:

Metal carbonate + acid --> salt + water + carbon dioxide

Thus:

CaCO3(s) + 2HNO3(aq) --> Ca(NO3)2(aq) + H2O(l) + CO2(g)

So, then putting in the aqueous ions:

CaCO3(s) + 2H+(aq) + NO32-(aq) --> Ca2+(aq) + NO32-(aq) + H2O(l) + CO2(g)

Cancelling the spectator ions:

CaCO3(s) + 2H+(aq) --> Ca2+(aq) + H2O(l) + CO2(g)

So, is this it? I believe so, given that CaCO3(s) is a solid, and H2O(l) and CO2(g) are covalently bonded. Am I wrong? The mark scheme to the question that posed this problem says I am!
2. Its safe to assume that the aqueous acid would dissolve the calcium carbonate
3. That is mainly correct.
However when you put in the aqueous ions you couldnt have NO3 2-, you would have 2NO3 1-.

The rest of the equations are correct.
CaCO3 is a solid, H2O and CO2 are both covelently bonded.

What does the markscheme say is wrong?

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