Problem: The distribution coefficient, k = (conc. in ligroin/ conc. in water), between ligroin and water for solute A is 7.5 . What weight of A would be removed from a solution of 10g of A in 100mL of water by a single extraction with 100 mL of ligroin? What weight of A would be removed by four successive extractions with 25mL portions of ligroin? How much ligroin would be required to remove 98.5% of A in a single extraction? I'm having so much trouble with this problem. I plugged in the numbers giving to find the first part. After calculations, I found out that depending on the way you divide and multiply to find the weight removed, I'm assuming that 750 grams of A is removed. However, I'm not sure, not even sure if I'm doing this right. ANY SUGGESTIONS PLEASE?!?!