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Additional resources for Principles and Practice of Analytical Chemistry
1 g of iodine from 50 cm 3 of an aqueous solution of iodine And sodium chloride is required. e. 7% of the I 2 is extracted. e. 97% of the I 2 is extracted which for most purposes can be considered quantitative. It is clear therefore that extracting several times with small volumes of organic solvent is more efficient than one extraction with a large volume. This is of particular significance when the value of D is less than 10 2 . SELECTIVITY OF EXTRACTION Often, it is not possible to extract one solute quantitatively without partial extraction of another.
7% of the I 2 is extracted. e. 97% of the I 2 is extracted which for most purposes can be considered quantitative. It is clear therefore that extracting several times with small volumes of organic solvent is more efficient than one extraction with a large volume. This is of particular significance when the value of D is less than 10 2 . SELECTIVITY OF EXTRACTION Often, it is not possible to extract one solute quantitatively without partial extraction of another. The ability to separate two solutes depends on the relative magnitudes of their distribution ratios.
_ D EXTRACTION OF XWCHARGED METAL CHELATES The process of chelation, was discussed in chapter 3. ) 64 ^P ' ANALYTICAL CHEMISTRT^P *.. Thus, for a given reagent and solvent, the extraction of the metal chelate is dependent only upon pH and the concentration of reagent in the organic phase and is independent of the initial metal concentration. e. 27) SEPARATION TECHNIQUES' . . 65 . complex, the lower the pH range over which'the metal will be extracted. Increased reagent concentration has a similar effect.