The solubilities of zinc complexes of 8-quinolinol and some derivatives of 8-quinolinol

The solubilities of bis-8-quinolinolo-zinc^II, bis-2-methyl-8-quinolinolo-zinc^II and bis-5 : 7-dibromo-S-quinolinolo-zinc^II have been measured over the pH range of 4.5 to 9 at ionic strengths of 0.114 and 0.230 and at 25° and 40°. A mathematical treatment of the results gave nearly constant solubility products only when a dissolved but undissociated molecule, in addition to all of the dissociated and partly dissociated species, was considered. The relative abundance of each species of molecule in solution has been calculated.