Hydroxide complexes of lanthanides-VI.
Experiments performed previously with cerium(III), samarium and gadolinium have been extended to conditions of high pC(H) in order to discover any amphoteric character. Up to pC(H) 14.6, the solubility of gadolinium hydroxide and of cerium(III) hydroxide does not increase, so the previously reported constants hold up to this pC(H). The solubility of samarium hydroxide increases at high pC(H), and the value log ( *)beta(4) = -36.7 can be deduced. This should be added to the previously reported set, now applicable up to pC(H) 14.5.
Kragten
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Natuurkundig Laboratorium der Universiteit van Amsterdam, Valckenierstraat 65, 1018 XE Amsterdam, The Netherlands.
Decnop-Weever
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LG