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How to tell if ionic compound has a higher melting point?

  1. Feb 13, 2012 #1
    I know that MgO has a higher melting point than NaCl as Mg is Mg2+ while O is O2- while Na is Na+ and Cl ia Cl-. but in CuCO3 and Na2CO3, Na2CO3 has a higher melting point compared to CuCO3. So I'm not sure how to tell which ionic compound will have a higher melting point than another when they are more complicated. Any guides on how to roughly tell this would greatly be appreciated.

    Thanks so much for the help!
  2. jcsd
  3. Feb 13, 2012 #2


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    Staff: Mentor

    Simple approaches won't work for more complicated compounds.
  4. Feb 13, 2012 #3
    Oh ok thanks this needs lattice energy and other complicated stuff...
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