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The melting point of KCl is 776 C whereas the melting point of NaCl is 801 C.
1. Identify the type of bonding in each substance.
A: Both NaCl and KCl are ionic.
2. Account for the differences in the boiling points of the substances using principles of atomic structure, bonding, and/or intermolecular forces.
K+ is a larger ion than Na+. Therefore the K+ and Cl- ions can't get as close as the do with Na+ and Cl-. That results in a lower bond energy for KCl,
So a lower KCl boilng point results because less thermal energy is needed to break the bond.