Silicic acid

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A jelly-like semi-solid material composed of hydrated Silicon dioxide. Silicic acid, or hydrated silica, is prepared by acidifying a solution of Sodium silicate. When dried, silicic acid forms amorphous lumps that are called Silica gel. Hydrated silica is used for paper and textile coatings.

Synonyms and Related Terms

hydrated silica; silica gel (hydrated)


  • Contact may cause irritation.
  • Fisher Scientific: MSDS

Physical and Chemical Properties

Composition SiO2-nH2O
CAS 7699-41-4
Molecular Weight mol. wt. = 78.0977

Resources and Citations

  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 710
  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • Dictionary of Building Preservation, Ward Bucher, ed., John Wiley & Sons, Inc., New York City, 1996