The complexation between lead(ii) and hydroxide has been studied in molten (K,Na)NO, at 280 "C by various techniques. An inert platinized platinum wire bathed with a gaseous mixture of oxygen and water served as a hydroxide electrode in potentiometric determinations of the hydroxide activity in the melts. Only PbOH' and Pb20H3+ can be detected at the low hydroxide concentrations used. Raman spectra and 'H NMR experiments gave strong indications that hydroxide retains the proton also when coordinated to lead(\\). Oxide ions added to the melts readily transform into hydroxide even at very low water activities. Studies of the solubility of Pb(NO,), in melts with various concentrations of dissolved PbO show the formation of [PbOH+],-species at fairly high hydroxide concentrations. Liquid X-ray scattering data yield 9 = 2 at these hydroxide concFntrations, i.e.
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