why does some materials dissolve in water and some don't
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Some materials dissolve in water and some don't because C2H5OH has a polar OH bond that the water molecules like to hang around. Many substances do not dissolve in water and that is because they are non-polar and do not interact well with water molecules. A common example is oil and water. Oil contains molecules that are non-polar, thus they do not dissolve in water.
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the soluble matter should have the same property with the solvent.
In this case, solubility depends upon polarity of water.
the substance which is polar will be soluble in water. (because water is polar)
which is not polar is soluble in non polar solvent like benzene.. ( benzene is non polar)
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