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Why is silica in a normal form not very reactive?

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Silica is silicon dioxide. It is the chief ingredient in sand and in glass. Basically, what is going to happen to it? Pretty much nothing reacts with sand and glass is what you use to hold other things like acids and organic solvents. read more

Colloidal silica as the name suggests, is polymerised silica in an insoluble colloidal form without a charge and hence not exchangable over ion exchangers. Reactive silica exists as sodium silicate and hence exchangable over type 1 anion exchanger which has highest affinity for silica. Colloidal silica is best removed by adsorption on floc generated with FeCl3 which precipitates in alkaline pH as Fe(OH)3 and is removed in clarifiers. read more

Silica is generally found in water supplies in three different forms: reactive, colloidal and suspended particles (e.g., sand), with the reactive being that portion of the total dissolved silica that is readily reacted in the standard molybdate colorimetric test, and the colloidal being that which is not. Total silica should be the sum of the reactive silica and colloidal silica. read more

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Further Research

What is Silica?
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Why is SiO not stable like CO
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