In this redetermination of the atomic weight of aluminum, weighed portions of the metal were converted to the hydroxide and sulphate, respectively. These were then heated until they were changed to the oxide, A1 20 3, which was finally ignited at 1,200 to 1,300 C. By this procedure, the atomic weight is related directly to that of oxygen.
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Hoffman et al. (1937) studied this question.