Nonpolar Gases Are Poorly Soluble in Water

The molecules of the biologically important gases CO2, O2, and N2 are nonpolar. In O2 and N2, electrons are shared equally by both atoms. In CO2, each C=O bond is polar, but the two dipoles are oppositely directed and cancel each other (Table 2-3). The movement of molecules from the disordered gas phase into aqueous solution constrains their motion and the motion of water molecules and therefore represents a decrease in entropy. The nonpolar nature of these gases and the decrease in entropy when they enter solution combine to make them very poorly soluble in water (Table 2-3). Some organisms have water-soluble carrier proteins (hemoglobin and myoglobin, for example) that facilitate the transport of O2. Carbon dioxide forms carbonic acid (H2CO3) in aqueous solution and is transported as the HCO— (bicarbonate) ion, either free—bicarbonate is very soluble in water (~100 g/L at 25 °C)—or bound to hemoglobin. Two other gases, NH3 and H2S, also have biological roles in some organisms; these gases are polar and dissolve readily in water.

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Responses

  • anna
    Why non polar gases are poorly soluble in water?
    7 years ago
  • rosamunda
    Why nonpolar gases are poorly soluble in water?
    2 years ago
  • sofia
    Why are nonpolar geses poorly soluble in water?
    1 year ago
  • codey
    Why are nonpolar molecules poorly soluble in water?
    7 months ago
  • BISRAT TEODROS
    Why nonpolar gase poorly dissolve in water?
    4 months ago

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