Download e-book for iPad: Critical Evaluation of Some Equilibrium Constants Involving by Y. Marcus

By Y. Marcus

ISBN-10: 0408706465

ISBN-13: 9780408706469

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M = C M /C M , provided MA«S It is doubtful whether the corrections from C. g. e. in aqueous uranyl nitrate, 2+ [A ] = 2[M ] so that 2+ - 2 [Mz ][A ] is replaceable by The quantity [S] is somewhat more difficult to estimate accuratley. 4[M 2+3 ] . The total analytical concentration of S at equilibrium, C„, differs somewhat from the in­ itial value C ° because of water coextration (or HA and water coextraction, when the former is present), causing volume changes, approximately proportional to C q .

Acta, 24A, 529 (1968). J. , J. Phys. , 73_, 675 (1969). VII. Solvent: Tri-n-butylphosphate (TBP) , S Ligand: Nitrate (NO ~) , A~ Reaction: H + + A~ + S" = HAS (VII-1) This reaction is the major one in this system with both undiluted S as well as with its solutions in inert diluents, provided the HA concentration in the equilibrium aqueous phase is below 7 M. (56A, 56F, 57A, 58P, 58S, 60A, 62D, 63N, 64Z, 65K, 65S, 69S) Above this concentration, more HA enters the organic phase than cor- - 34 responds to HAS.

1 (X-scale) in any case, so the value of n is immaterial. 01 x H ^ Q ^ . (VIII-7) where x is the molar ratio of water to S in undiluted, hydrated S and p is the density of this phase, will be taken as the 7 ς = 1 arbitrarily. equilibrium constant, setting The data of several authors (59B, 591, 60H) can be utilized, since they pertain to sufficiently low C„. , and yield small values Q ^ v cannot be extrapolated back. ^ so that their disagreement is im­ material. (59B). The data have been corrected to the molar scale where necessary The values obtained are shown in Table VIII-1.

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Critical Evaluation of Some Equilibrium Constants Involving Organophosphorus Extractants by Y. Marcus


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