Silicic acid
Silicic acid is a compound of formula n, which can be prepared by reacting a soluble silicate with an acid. Simple silicic acid such as partial silicic acid H2SiO3, disodium silicate H2Si2O5 and orthosilicate H4SiO4 have been detected in dilute solution; partial silicic acid can only exist at about 0 ℃, at room temperature when condensed into disodium silicate, At 150 ° C into an amorphous state. Soluble silicate, plus any weak acid, can be silicic acid; free monomolecular silicic acid, soluble in water, but it gradually in the solution of the merger of two molecules, three molecules, and finally the formation of insoluble Multi-molecular polymer, the resulting colloid called "silicic acid sol"; if the silicate solution concentration is large, then add acid directly after the formation of silicate gel, dehydration after silicic acid gel; silica gel used to absorb all kinds of Gas and steam, refined oil, etc., and can be used as a carrier for the catalyst. ...