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Hydrolysis of the Aluminium Ion 820. Hydrolysis of the Aluminium Ion : Ultracentrifugation and Acidity Measurements By J. AVESTON Equilibrium ultracentrifugation and acidicity measurements of hydrolysed aluminium perchlorate solutions in 1M-sodium perchlorate a t 25" have been interpreted by assuming the species Al,(OH) 24+ and Al,3(OH)3,7+. The leastsquares refined formation-constants are ZAP' + 2H20 = [A12(OH),]4+ log p, , , = -7.07 f 0.06 13AP' 4-32HZO = [A1,3(OH)3J7+ log f&2,13 = -104.5 0.06

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