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NaCl has a very large difference in electronegativity compared to HCl resulting is stronger dipole dipole forces. Also, NaCl is larger and has more electrons than hydrogen therefore has stronger London dispersion forces. Since, both of these intermolecular forces are stronger than those in HCl, the melting point for NaCl is higher because it would requires more energy to break the forces.
NaCl has a higher melting point than HCl because it is ionic vs HCl which is not. Ion-ion bonds are always more strongly held together than non ion-ion bonds which means you need more energy to break apart NaCl. This results in a higher melting point.
Matt Sanruk 4F wrote:So all ionic compounds will have higher imf, boiling and freezing points than any covalent molecule, right?
Yes, ionic compounds have the strongest intermolecular forces compared to the covalent molecules, as well as they generally have higher boiling and melting points.
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