Aluminium (iii) reacts with the Chelating agent HL to give a complex AlL3 that is readily soluble in CHCl3. A spectrophotometric study shows that when a 3.75104M aquebus solution of aluminium was extracted with CHCl3 containing 0.0050MHL, the analytical concentration of aluminium at pH5.8 in the two phases were 3.0104M[Al3+]upper) and 7.5105M([AlLL]l lower ). What is the distribution coefficient at pH6. A. 18 B. 16 C. 6 D. 12