Nomenclature
CAS number: 1343-98-2
Precipitated silica.
Description and references
Commercial product available with variable
amounts of water up to 16% as SiO2.nH2O. Occurs
in nature as opal. Monograph: E. A. Hauser, Silicic
Science (Van Nostrand, Princeton, 1958). Short review
of chemistry: S. A. Greenberg, J. Chem. Educ. 36, 218-219 (1959).
Properties
White, amorphous powder. Insol in water or acids
except hydrofluoric (
see under Silicon Dioxide); sol in hot fixed alk hydroxide
solns.
Derivative
Silica gel.
Properties
Pptd silicic acid in form of lustrous granules,
esp prepd and adapted for absorption of various vapors.Use
Sorbent for column chromatography.