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When of acetic acid is shaken vigorously with of activated carbon, the final equilibrium concentratiSurface Chemistry Chemistry Question

Question

When $100\text{ mL}$ of $0.6\text{ M}$ acetic acid is shaken vigorously with $2\text{ g}$ of activated carbon, the final equilibrium concentration drops to $0.5\text{ M}$. What exact mass of acetic acid is adsorbed per gram of carbon?

Answer: A

💡 Solution & Explanation

Initial moles $= 0.6 \times 0.1 = 0.06\text{ mol}$. Final moles $= 0.5 \times 0.1 = 0.05\text{ mol}$. Moles adsorbed $= 0.01\text{ mol}$. Mass adsorbed $= 0.01 \times 60\text{ g/mol} = 0.6\text{ g} = 600\text{ mg}$. Mass adsorbed per gram of carbon $= 600\text{ mg} / 2\text{ g} = 300\text{ mg}$.

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