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Question
Why has sodium chloride a high melting point?
Long Answer
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Solution
Sodium chloride is an ionic compound composed of a giant crystal lattice of alternating, oppositely charged sodium ions (Na+) and chloride ions (Cl−). Because these oppositely charged species alternate in a three-dimensional network, extremely strong electrostatic forces of attraction (ionic bonds) hold the lattice together. A large amount of thermal energy is required to break these strong ionic bonds throughout the lattice to allow the ions to move freely. Therefore, sodium chloride has a high melting point.
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