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Like dissolves like.

Water is an extremely polar solvent because of its ability to form hydrogen bonds with neighbouring water molecules (the partial negative of Oxygen is attracted to the partial positive charge on the hydrogen atoms). Therefore, if a substance dissolves readily in water, it would be polar.

Think of the inability to dissolve oil in water. Oil, a lipid, is a fatty acid hydrocarbon. Hydrocarbons are infamously nonpolar and would "repel" the polar water molecules.

Take note, however, that this is generalised notion. There are always exceptions, especially in a biological system, because slightly nonpolar molecules can end up dissolving in polar water.

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Q: If a substance dissolves in H2O would it be polar or non-polar?
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A nonpolar substance, such as vegetable oil, would not dissolve well in water because water is a polar molecule and dissolves other polar molecules and many ionic compounds, but not nonpolar substances.

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