Polar substances can mix the best with water.
We know that in chemistry, like dissolve like. Substances are able to interact with each other if they share some kind of intermolecular interaction with each other.
Water is a polar molecule. Only a polar solvent can dissolve a polar solute. A nonpolar solute can not dissolve in a polar solvent such as water as such, only polar substances can mix the best with water.
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