Sodium Chloride is ionic, so when it dissolves water molecules attatch to the sodium and chloride ions and they then seperate. The positive Hydrogen molecules are attracted to the negatively charged Chloride ions and the negatively charged Oxygen is attracted to the positive Sodium ions.
Why is the freezing point lowered when salt is added to water?
The Na+ and the Cl- get in the way of the water molecules making it harder for them to rearrange and become crystals. Meaning, the salt water remains in a liquid state longer as the temp reduces.
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