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The catalytic role of Mg 2+ ions in the polycondensation of silicic acid to form amorphous silica has been investigated in detail. This behavior is pH-dependent. As pH increases (herein, the three pH values 8.0, 9.0, and 9.5 were tested), the catalytic effect of Mg 2+ ions becomes more pronounced. Also, this behavior is directly proportional to the concentration of Mg 2+ . Ethylenediaminetetraacetic acid (EDTA) can inhibit this catalytic effect by strongly chelating the Mg 2+ ions. This research can be further expanded to other chelating agents that have an affinity for Mg 2+ ions.
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Demadis et al. (2012) studied this question.
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