What is the difference when a concentrated solution of KCl is shaken with charcoal and when a dilute
solution of KCl is shaken with charcoal?

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Solution

Dear student,

When concentrated KCl is shaken with charcoal, it shows positive adsorption.
When dilute KCl is shaken with charcoal, it shows negative adsorption.

Adsorption:
It is the process in which, molecular species accommodate on the surface rather than in the bulk of a solid or liquid.
The molecular species that accommodate at the surface is called adsorbate.
The material on the surface of which the adsorbate takes place is called adsorbent.

POSITIVE ADSORPTION:
In positive adsorption, adsorbate is more on the surface of the adsorbent compared to that in the bulk.

NEGATIVE ADSORPTION:
In negative adsorption, adsorbate is less on the surface of the adsorbent compared to that in the bulk.

Regards,

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What is the difference when a concentrated solution of KCl is shaken with charcoal and when a dilute solution of KCl is shaken with charcoal?

What is the difference when a concentrated solution of KCl is shaken with charcoal and when a dilute
solution of KCl is shaken with charcoal?