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Can a hydrogen bond also act as an ionic bond?


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If the water managed to pull that hydrogen completely off the other moleules (i.e deprotonate it) then you'd have an ionic interaction. I think ionic bonds are typically reserved for things like Na+ and Cl- in a lattice.

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No. Ionic bonding occurs when one molecule loses an electron and one gains an electron or. The resulting exchange creates a cation and an anion held together by their opposite charges. Hydrogen bonds are similar to ionic bonds in that respect, however they are bonds of partial charges; charges created by the polar properties of the molecule that don't quite equal enough of a force to be a true strong bond. Virtually anything that hydrogen bonds has a polar-covalent bond and an electron exchange would involve the breaking of the bond (as in deprotonation mentioned by Horza2002) to form another compound. So water cannot create an ionic bond without losing an atom of some kind.

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If the water managed to pull that hydrogen completely off the other moleules (i.e deprotonate it) then you'd have an ionic interaction. I think ionic bonds are typically reserved for things like Na+ and Cl- in a lattice.

 

That would be possible with H3O+, then... right?

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In principle yes, there is that equilibrium. But in practise the equilbrium will lie well on the side of 2 H2O.

 

http://www.chemguide.co.uk/physical/acidbaseeqia/kw.html

 

That link exaplins what is kown as the ionic product of water, Kw. It calculates that at any one time, there is only 1x10(-7) M of the ionic form ion water so it is indeed tiny.

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