Wednesday, January 19, 2011

Day Six: Activity Four

Show an image or animation or description of what is happening when water dissolves NaCl.


Why is the freezing point lowered when salt is added to water?
Water molecules form crystals when freezing. Na+ and Cl- ions from the salt get in the way of the water molecules, making it harder for them to become re-arranged into crystals. This means that salt water remains in a liquid state for longer as the temperature reduces.

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