An organic compound B has a solubility of 8.0g in 200ml of water at 20°c and 20.0g in 200ml in benzene at the same temp.if 4.4g of B dissolved in 200ml of water is extracted with 200ml of benzene

Question

Calculate Kp,calculate the amount of B left in the aqueous layer after the extraction,the amount of B left after the second extraction using 100ml benzene in each case

Answer 1

B_aq = 8.0 g/200 ml = 0.04 g/ml

B_org = 20.0 g/200 ml = 0.1 g/ml

D = distribution = B_org/B_aq = 0.1/0.04 = 2.5 = Kp if ideal conditions exist (no ionization, alteration, etc)

The rest of the question in somewhat unclear. It appears that the first extraction is 200 ml aqueous extracted with 200 ml benzene, but it isn't clear if the second extraction is 200 ml of aqueous extracted with 100 ml benzene, or if it is 100 ml aqueous extracted with 100 ml benzene.