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Ion-pair formation constants (mol−1 dm3 unit), KMX for a univalent metal salt (MX) and KMLX for its ion-pair complex (ML+X−) with a crown ether (L) in water, were determined at various ionic strengths (I) and 25°C by potentiometry with ion-selective electrodes for MX=NaPic, NaMnO4, NaBPh4, KPic, and KMnO4; and MLX=Na(18C6)Pic, K(18C6)Pic, and Na(18C6)BPh4, where Pic− and 18C6 denote a picrate ion...
Ion-pair formation constants (K MLA mol -1 dm 3 ) of Na + - and K + -18-crown-6 ether (18C6) complexes with MnO 4- in water (w) were determined potentiometrically at 25 o C. Simultaneously, extraction constants (K ex mol -2 dm 6 ) of the permanganates with 18C6 from w into 1,2-dichloroethane...
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