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What can cause course salt to melt? If you put it on a flat surface, can it melt on its own into water? What causes this reaction to make the salt melt?

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closed as unclear what you're asking by orthocresol, Wildcat, Martin - マーチン Sep 14 '16 at 10:36

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

  • $\begingroup$ Welcome to Chemistry.SE! Take the tour to get familiar with this site. Mathematical expressions and equations can be formatted using $\LaTeX$ syntax. This appears to be a homework question, please share your thoughts and attempts towards the solution. Please also clarify to me what course salt is? $\endgroup$ – Martin - マーチン Sep 14 '16 at 10:35
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Salts can't "melt" at room temperature, much less into a water solution. What might happen for some salts is that they're able to draw humidity from the environment with such avidity that they become a liquid solution. If a compund can do this we call it deliquescent.

Source: https://en.wikipedia.org/wiki/Hygroscopy#Deliquescence

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