Abstract
AbstractThe solubility of gibbsite was determined in supersaturated and undersaturated AlCl3 solutions as well as in 0.01M CaCl2 soil extracts. The rate of dissolution of gibbsite in undersaturated solutions was extremely slow. In supersaturated solutions that were seeded with gibbsite, equilibrium was established after 1 to 3 months. The solubility product, expressed as pKsp, was found to be 33.5 at 25°C., which agrees well with a value of 33.8 calculated from thermodynamic data. Owing to the relatively large amount of adsorbed aluminum ions as compared to that present in solution, the time necessary to reach the solubility product of gibbsite was found to be much longer in a clay or soil suspension than in an aqueous solution having the same pH value.
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