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Engineering Chemistry by K. Sesha Maheswaramma

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10

SURFACE CHEMISTRY

10.1 INTRODUCTION

“Surface chemistry is the branch of chemistry which deals with the study of the phenomenon occurring at the surface or interface, that is, at the boundary separating two bulk phases.” We know that number of phenomena occur at the interface, for example, dissolution, crystallization, corrosion, electrode processes, etc.

10.2 ADSORPTION

It is observed that when certain solids like charcoal, silica, etc., are added into a closed vessel containing some gas or aqueous solution of a solute, the molecules of the gas or the solute are attracted towards the surface of the solid and then retained on the surface. As a result, the concentration of the gas or the solute on the surface of the solid increases. This is ...

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