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At $25~\mathrm{^\circ C}$, the solubility of ozone is $109~\mathrm{mg~L^{-1}}$. This is $13$ times higher than the solubility of diatomic oxygen. What causes this?

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    $\begingroup$ It is polar. That would be my guess. $\endgroup$ – bon Jan 8 '16 at 14:02
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If you look at the molecular structure of ozone below, you can see that it is polar. Diatomic oxygen is non-polar. This mild polarity of ozone greatly enhances the solubility of the molecule in a polar solvent like water.

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