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Water is a polar solvent, but in the supercritical fluid state, it is much less polar, I presume because of the cleavage of hydrogen bonds. On the other hand, carbon dioxide is non-polar, but as a supercritical fluid it is more polar. Why is this so?

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    $\begingroup$ Geez, again this mixing of net dipole and solvent polarity, it doesn't matter much that CO2 has no net dipole. $\endgroup$ – Mithoron Apr 3 '17 at 20:00
  • $\begingroup$ It has a quadrupole moment, I guess it is related to it's polarity. $\endgroup$ – RBW Apr 3 '17 at 20:06

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