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what is the melting point of nacl?
The melting point of a solid is determined by heating it until it melts into a liquid. A typical method uses a small sample of the substance in a capillary tube which is placed into a temperature controlled measuring apparatus where it slowly heats up from the set temperature until it is melted.
Melting points of pure substances are typically in the region of 801 deg C but the temperature at which a mixture of two or more salts will form a liquid is often far lower. For example, the melting point of a mixture of pure sodium chloride and pure potassium chloride is 771 deg C but when mixed together in equal volumes it can be lowered to 657 deg C, a reduction of more than half.
Other properties of salt include its hygroscopicity, or its ability to absorb water, which causes crystals to become soft and frosted in the process. In addition, salts are excellent optical components as they can transmit a large amount of light.
Using the right amount of salt to form a crystal is vital as it helps to stabilise the formation of the crystal and maintain its shape. Other properties of the salt include its impressive 3D crystalline structure and spectroscopic properties.
The main reason salt is the best suited for this task is its high melting point, which has been demonstrated by researchers using a pressure calibrator at 6.5 GPa.