In a solution of 100 mL 0.5 M acetic acid, one gram of active charcoal is added, which adsorbs acetic acid. It is found that the concentration of acetic acid becomes 0.49M. If surface area of charcoal

Question

In a solution of 100 mL 0.5 M acetic acid, one gram of active charcoal is added, which adsorbs acetic acid. It is found that the concentration of acetic acid becomes 0.49M. If surface area of charcoal is , calculate the area occupied by a single acetic acid molecule on the surface of charcoal.

Canvas Classes · Accepted Answer

The drop in acid concentration tells you how much acid the charcoal grabbed. Convert that to molecules, then divide the total surface area among them.

Moles adsorbed

Molecules adsorbed

Area per molecule

Watch out: the adsorbed amount is the fall in concentration (), not the full . A tiny concentration change is exactly what monolayer adsorption gives.

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