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Is there a particular substance inside both oil and salt, that keeps the oil from freezing?
Answer 1:

Salt comprises two ions, sodium (+) and chloride (-) in a 1:1 ratio. This ionic character is what allows salt to dissolve in polar liquids such as water, and keeps it from dissolving on non-polar liquids such as oil. When salt is dissolved in water, it lowers the freezing point (below 32 degrees F or 0 degrees C) due to interrupting the molecular forces between the water molecules. However, as it does not dissolve in most oils, I would not expect it to lower the freezing point, or really interact at all with the oil. I am not sure where you heard that salt keeps oil from freezing, but I am not familiar with this at all.


Answer 2:

Oil cannot dissolve salt. Salt requires a "polar" solvent to dissolve (e.g. water).



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