50 mL of 1M oxalic acid (molar mass = 126 g mol-1) is shaken with 0.5 g of wood charcoal. The final concentration of the solution after adsorption is 0.5 M. Amount of oxalic acid in grams adsorbed per gram of the charcoal is

50 mL of 1 M oxalic acid = 50 × 1millimo50 mL of 0.5 M oxalic acid = 50 × 0.5 millimolThus, oxalic acid adsorbed = 50(1- 0.5)=50×0.5 millimol =50×0.51000mol=50×0.51000×126g=3.15gCharcoal = 0.5g Thus, oxalic acid adsorbed per gram of charcoal =3.150.5=6.3