試題詳解

複選題
5. For solvent extraction, which of the following statements are correct?
 (1) For neutral analytes, many small extractions are less effective than few large extractions.
(2) The larger the partition coefficient ([S]₂/[S]₁) of a neutral analyte, the less the analyte remain in phase 2. (3) To extract the base analytes into organic phase, use a pH high enough to convert BH into  B.
(4) To extract the acid HA into organic phase, use a pH low enough to convert A^- into HA. (5) Most complexes that can be extracted into organic solvent are neutral, and charged complexes are less soluble in organic solvents. Your answer:
(A) (1), (3) and (4)；
(B) (2) and (3)；
(C)(3), (4) and (5)；
(D)(3) and (4)；
(E) The statements are all correct.