Extraction of Tetraphenylarsonium Permanganate:

Tetraphenylarsonium chloride is a water soluble salt. This forms chloroform extractable complexes with anions like permanganate, perrhenate and pertechnate. The quantitative treatment of the extraction equilibrium is similar to those proposed for metal complexes.

Dissociation of the reagent (R₄As⁺.Cl-), R= C₆H₅

(R₄As⁺. Cl ^- )_a ↔        R₄As_a⁺   + Cl ^-_a                                                              ... (3.36)

K = [R₄As⁺]_a[Cl^-]_a/[(R₄As⁺Cl^-)]_a

The dissociation constant K has a high value.