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How/why does salt and ice burn you?

The Fine Brothers on YouTube uploaded Elders react to different challenges. One of them is the Salt and Ice one. I don't get how salt and ice can do that to your skin.

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When Salt is added to ice i makes the ices temp. go way down Making A Chemical Reaction.

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So the salt can lower the ice temperate. That's why we put salt on ice to melt it, right?
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idk who puts salt on ice to melt it but yes it does.
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Salt lowers the freezing point of ice - that's why we put salt on icy walkways and roads - to return ice to a watery state. It can lower the freezing point to as low as -17C (almost zero Fahrenheit), so in temperatures lower than that - salting the ice is pointless. With this trick you don't actually burn your arm (like you would with heat) rather you are experiencing frost bite (burning from cold).

http://www.ehow.com/about_6554297_ice-salt-burn-skin_.html
http://en.wikipedia.org/wiki/Salt_and_ice_challenge
http://www.sheknows.com/parenting/articles/965301/the-salt-and-ice-challenge-dont-let-your-teen-get-burned

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Hanks for your answer. Very helpful!
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Sorry thanks not hanks
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