Question

Why NACL and KNO3 are used to form freezing mixture​

Answer 1

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Road salt works by lowering the freezing point of water via a process called freezing point depression. The freezing point of the water is lowered once the salt is added, so it the salt makes it more difficult for water to freeze.

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Answer 2

hey mates your answer is here

In European countries, they use NaCl or KCl to melt ice during the winter season. In Asian Countries, they use NaCl to keep the ice without melting, for example in ice cream and beer boxes.

I asked my chemistry teacher about this and his answer was,

when you add ions to the ice, its melting point goes (i.e. freezing point of water) to -9 to -19 degree Celsius, depending on the amount of ions. The reason behind that is, when water becomes ice its water molecules re-arrange to specific shapes (see the link for the video at bottom). After we put ions to it, ions disturb that shape as they come in-between the water molecules. If water wants to be ice again, it should be like -9 degree Celsius because of these ions disturbing them to rearrange as a solid.

I also asked my Physics teacher about this and his answer was,

When we put salt into water, its temperature goes down to somewhere around −6 ∘C, so that it takes more time to come to 0 ∘C and begins melting

may be it's helpful for you

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