Why is the melting point of Nacl much higher than that of Alcl3?
- 9 years agoFavorite Answer
let us answer from point of chemical properties of ionic and covalent compounds.
we know that ionic compounds have more melting and boiling points than covalent compounds.
compare NaCl , AlCl3 .
NaCl is more ionic than AlCl3 because ionic character depends on size of cations as here anions are same more the size more the ionic character.
Na+ has more size than Al+++.
so the melting point of Nacl is much higher than that of Alcl3
- Anonymous5 years ago
Assuming that you're talking about aqueous solutions of each at the same concentration, then the answer is table sugar. That's a molecular compound, and if you have a 1M solution, there is one mole of sugar molecules present in solution. If you have a 1M solution of KCl, there are two moles of ions in solution (KCl dissociates in solution to give K+ and Cl- ions). For 1M AlCl3, there will be four moles of ions in solution (Al3+ and 3 Cl-). Vapor pressure decreases as the number of solute particles in solution increases (Raoult's law), so the sugar solution, with the smallest concentration of dissolved particles, will have the highest vapor pressure.
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- 9 years ago
The electronegativity of a sodium ION is much higher than that of a aluminum ION