Question

iron (III) reacts with chelating agent HL to give a complex FeL3 that is readily soluable in CHCl3.A spectrophotometric study shows that when 1.5x10^-4 M aqueous solution of iron was extracted with CHCl3 containing .0250M HL,the analytical concentration of iron at ph6 in the two phases were 1.0×10^-4 and 5.0×10^-5.What is the distribution coefficient if 50ml of 1.00×10^-5M Fe3+ in a ph6 buffer were to be extracted with 25ml portions of .100M HL in CHCl3 how many extractions would be required to remove 99.5% of the iron from the aqueous phase

Answer 1