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

In summary, the speaker discusses the differences in melting points between MgO and NaCl, citing the charges of their respective ions. They also mention the higher melting point of Na2CO3 compared to CuCO3 and express uncertainty in determining the melting point of more complex ionic compounds. They request guidance on how to do so and acknowledge that simple approaches will not suffice.
  • #1
sgstudent
739
3
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!
 
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  • #2
Simple approaches won't work for more complicated compounds.
 
  • #3
Oh ok thanks this needs lattice energy and other complicated stuff...
 

1. How does the type of bond affect the melting point of an ionic compound?

The strength of the bond between ions in an ionic compound is directly related to its melting point. The stronger the bond, the higher the melting point will be.

2. What properties of the ions contribute to the melting point of an ionic compound?

The charge and size of the ions play a significant role in determining the melting point of an ionic compound. Compounds with ions that have higher charges and smaller sizes tend to have higher melting points.

3. Can the arrangement of ions in a crystal lattice affect the melting point of an ionic compound?

Yes, the arrangement of ions in a crystal lattice can also impact the melting point of an ionic compound. A more tightly packed crystal lattice will have a higher melting point compared to a less tightly packed lattice.

4. How do intermolecular forces affect the melting point of an ionic compound?

Intermolecular forces, such as dipole-dipole interactions and London dispersion forces, are weaker in ionic compounds compared to covalent compounds. Therefore, they have less of an impact on the melting point of an ionic compound.

5. What other factors can influence the melting point of an ionic compound?

The size and shape of the ions, as well as any external pressure or impurities, can also affect the melting point of an ionic compound. In addition, the presence of any covalent bonds within the compound can also impact the melting point.

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