Why do some liquids are soluble in water, some are insoluble/immiscible?
Answer:
Typically, it's a function of the polarity of the liquids; the general rule is that "like dissolves like". Polar solvents will mix readily with other polar solvents, and non-polar with other non-polar ones. Very polar solvents (like water) do not readily mix with very non-polar ones (like oils). "Polarity" is just how the charge of distributed across the surface of the molecules of the solvent.
because that's how they were made to be. some liquids (even solids) are water soluble and some are not. water insoluble substances has that property of having stronger molecular bond than the molecules of water so that water can not penetrate then easily and thus, is not disolved. water soluble substances are the other way around.
because some are not polar... like oil...
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