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Old Dec 5th 2018, 03:15 AM   #1
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Question surface tension

why does surface tension decrease on adding sparingly soluble substances and increase on adding highly soluble substances?
Plz somebody answer me.

Last edited by mak29; Dec 5th 2018 at 09:42 AM.
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Old Dec 5th 2018, 11:06 AM   #2
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I was not aware that there was a direct relationship between solubility and surface tension,
However I would not be too surprised to learn that there is an indirect relationship.

Surface tension is created by the molecular attraction between neighbouring molecules,
it is quite reasonable to suppose that introducing different types of molecule into the solution will affect the attraction between neighbours.

The solubility of a substance will be related to the attractiveness between the molecules of the substance and the molecules of the solute.
It therefore seems reasonable to suggest that there may thus also be a relationship between solubility and surface tension.

However, I must make clear that this is my thought, not my knowledge.
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