Question

When 200 mL of 0.2 M acetic acid is shaken with 0.6 g of wood charcoal, the final concentration of acetic acid after adsorption is 0.1 M. The mass of acetic acid adsorbed per gram of carbon is _____ g.

Answer 1

Mass of wood charcoal $= 0.6$ g
Initial moles of acetic acid $= 0.2 × 0.2 = 0.04$
Final moles of acetic acid $= 0.1 × 0.2 = 0.02$
Moles of acetic acid adsorbed $= 0.04 – 0.02 = 0.02$
Mass of acetic acid adsorbed per gm of charcoal $= \frac {0.02 × 60}{0.6} = 2.0$ g

So, the answer is $2$.