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what is the melting point of sodium chloride?

The melting point of sodium chloride is 801deg C (1474deg F)2 at which it melts into a liquid, thus becoming a “molten salt”. Molten salt has a higher melting temperature than a solid sodium chloride because its ions have a much stronger electrostatic attraction.

Despite the strong attraction, it takes more energy to melt a solid salt than it does to melt water because cations are attracted to each other, while anions are not. This is called Simon’s law.

Why is it important to know the melting point of a substance?

Besides being a good indicator of how much energy is required to change something from one form to another, the melting point is also an indication of the chemical’s stability. In particular, it indicates how well the material resists heat.

Why does it take more energy to melt a solid sodium chloride than it does to melt a solid water?

It is because the ions of sodium chloride have a stronger electrostatic attraction than cations do. This makes it easier for them to move freely, forming a liquid.

Moreover, the crystalline structure of salt means that the larger chloride ions are arranged in cubic close-packing, while the smaller sodium ions fill the octahedral gaps between them. This allows NaCl to absorb and retain moisture as a good desiccant, a substance that can prevent the growth of bacteria or mold in dry environments. It is also useful in reducing the freezing point of water, which is an essential component of de-icing roads and pavements.