The document discusses the adsorption isotherm of acetic acid (CH3COOH) and hydrochloric acid (HCl) on activated carbon. The procedure involves adding activated carbon to solutions of acetic acid and hydrochloric acid at varying concentrations. This is followed by filtration and titration with sodium hydroxide solution to determine the concentration of acid before and after adsorption. The data obtained is used to plot Langmuir and Freundlich isotherm curves. Both curves show that more activated carbon leads to more adsorption, but the amount adsorbed per gram of carbon decreases with increasing carbon amounts.