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Silica Sand Rise

Silica in the Ocean. Dissolved silica in the ocean largely takes the form of silicic acid, SiOH 4.Since it is acidic and has a pKa somewhat above normal seawater pH values pKa 9.5 in freshwater possibly it is a bit lower in seawater, about 5 of it will be present as silicate, SiOH 3 O .Apparently, many diatoms take up the SiOH 4 form directly, although there is some evidence ...

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