Extraction by Ion Pair Formation

In the preceding section, we have categorized the extraction of Fe(III) under solvate formation because the replacement of water by ether makes the species to favour the organic phase. Therefore, the system could be categorized under ion pair formation because the extracting species is being formed due to electrostatic attraction between cation HS⁺ and anion Fe(S)2Cl ^- . Here, we will discuss two extraction equilibria which are exclusively due to ion pair formation.

A) Extraction of permanganate ion through tetraphenylarsonium chloride.

B) Extraction of anionic metal complexes through high molecular weight amines popularly known as liquid anion exchangers.