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In column chromatography, What kind of bond interactions between alumina as a absorbent and water as...

In column chromatography,

What kind of bond interactions between alumina as a absorbent and water as a eluent?

And bond interactions between alumina and ethanol ?
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Answer #1

Alumina is a strongly polar compound and so is water, So the bond interactions between them are the formation of hydrogen bond and dipole-dipole attractions . Water is used as an eluent in column chromatography with alumina as adsorbent to separate a highly polar component in the solvent

As alumina is a polar compound and ethanol is a non-polar compound the only interaction between them is the Vander Wal's dispersion forces.Ethanol is used as an eluent in column chromatography with alumina as adsorbent to separate a non-polar or covalent component in the solvent.

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