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Picturing the water molecules on the molecular level, it clearly becomes evident that there is plenty of space for the molecules to further pack together. When sugar molecules dissolve in water, they tend to be surrounded by water molecules hydrogen bonding with themselves and the multiple hydroxy groups of the sugar. Basically the attraction between the sugar and water is strong enough that it pulls the molecules more closely together than in pure water. Therefore more substance is able to fill the same volume macroscopically, although it is likely that there will either be a net decrease or increase in volume, staying the same exact volume is a pretty rare phenomenom.

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12y ago

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