Solvent Extraction of Mono(salicylato)beryllium, and the pH Titration of the System Beryllium-Salicylic Acid

Abstract

It has been shown that a salicylatoberyllium complex can be extracted from aqueous solutions by aliphatic alcohols. The distribution ratio is a symmetrical function of the logarithm of the free ligand concentration and passes through a maximum value ; the stability constants of the mono- and bis(salicylato)beryllium complexes have been determined from the data for points of equal extraction. The values obtained in this way are β₁ = 4.1 x 10¹² and β₂ = 4.3 x 10²², in an ionic strength of 0.15. They agree fairly well with those obtained by pH-titration procedures, which are β1 = 6.1 x 10¹² and β₂ =7 x 10²².