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Clathrate, Hydration Shell

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Clathrate, Hydration Shell

Postby physgirl » Sun Sep 02, 2007 3:24 am

What's the difference between a clathrate and a hydration shell?

Is it right that in a hydration shell the water molecules are coming in and out, replacing the molecules that were already a part of the shell, "dynamic", but in a clathrate, everything is fixed and ordered (no replacement of molecules going on)?

I'm not really sure if I follow my book's descriptions of the two...
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Postby Jammerz » Wed Sep 05, 2007 2:35 am

You're mostly right...

a hydration shell is the result of a polar solvent (in this case water) orienting itself around ions due to the charge. The ions are essentially surrounded by a "shell" of water. The "shell" is not fixed, and molecules may move around, about, in and out... but they all orient themselves around the ion based on its charge.

A clathrate structure is a lattice structure... fixed and ordered like you said. Solid water (aka ice) forms a clathrate structure.
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