Using the distribution data for di(2-ethylhexyl)phosphoric acid (D2EHPA or RH) between kerosene and 0.10 kmol m - 3 (Na +,H + )Cl -, the equilibrium constants of D2EHPA such as the dimerization, the distribution, and the acid dissociation constants were determined as K 2 = 3.39 × 10 4 m 3 kmol - 1, K d = 1.66 × 10 3 kmol m -3, and K a = 1.99 × 10 - 2 kmol m -3, respectively. The extraction equilibrium formulation was established for the distribution of Mn(II) between kerosene containing D2EHPA and 0.10 kmol m - 3 (Na +,H + )Cl - . The composition of the extracted species is in the organic phase. The single species exists in the range of less than 20% of the extractant being converted to the complex. The extraction equilibrium constant of this reaction was also found at 30 ± 0.5 °C.
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Biswas et al. (1999) studied this question.