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Full Ionic Equation? Nitric acid and calcium carbonate

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    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


    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!
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    Its safe to assume that the aqueous acid would dissolve the calcium carbonate
  3. Offline

    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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