5.16 Why is adsorption always exothermic?
5.16 Why is adsorption always exothermic?
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1 Answer
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5.16
When adsorbate (gas or liquid mostly) absorbed then their entropy get reduced i.e. ΔS is negative. For every spontaneous process ΔG must be negative. ΔG = ΔH - TΔS, as TΔS is positive (ΔS is negative) ΔH must be negative in order to make ΔG negative. Hence ΔH is negative that means the reaction is exothermic. Hence every adsorption reactions are exothermic.
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