Question

melting point of nacl is 800 while that of hcl is -114 why?

Answer 1

nacl has a very strong ionic bond due to the disparity in the electronegativity. So it requires a lot of energy to break the bond. That's why nacl has high melting point. but this is not so in case of hcl . so hcl has low melting point

Answer 2

The bond in NaCl is ionic, and in the NaCl lattice(the structure), each sodium atom is surrounded by 6 chlorine atoms...Some of these bonds would have to be broken to melt NaCl, and they would all have to be broken to boil this compound. As a result, ionic compounds such as NaCl tend to have high melting points and boiling points.

HCl on the other hand, is bounded by polar covalent bonds, which are comparatively weaker and boiling or melting it doesn't require reaking the bond between H and Cl. so the melting and boiling points of HCl are smaler than sodium chloride

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