silicic acid


silicic acid
any of certain amorphous gelatinous masses, formed when alkaline silicates are treated with acids, which dissociate readily into silica and water.
[1810-20]

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      a compound of silicon, oxygen, and hydrogen, regarded as the parent substance from which is derived a large family—the silicates—of minerals, salts, and esters. The acid itself, having the formula Si(OH)4, can be prepared only as an unstable solution in water; its molecules readily condense with one another to form water and polymeric chains, rings, sheets, or three-dimensional networks that constitute the structural units of silica gel (q.v.) and many minerals that have very low solubility in water.

      Several esters of silicic acid, made from alcohols and silicon tetrachloride, are thermally stable liquids employed as lubricants and hydraulic fluids. See also water glass.

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Universalium. 2010.

Look at other dictionaries:

  • Silicic acid — IUPAC name Silicic acid …   Wikipedia

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  • silicic acid — n. 1. any of several jellylike masses, SiO2·n H2O, precipitated by acidifying sodium silicate solution 2. any of several hypothetical acids of which the different mineral silicates may be regarded as salts …   English World dictionary

  • silicic acid — Obtained in water as a colloid by treating silicates; precipitated s. is silica gel. * * * silicic acid n any of various weakly acid substances obtained as gelatinous masses by treating silicates with acids * * * si·lic·ic ac·id (sĭ likґik)… …   Medical dictionary

  • silicic acid — noun Date: 1817 any of various weakly acid substances obtained as gelatinous masses by treating silicates with acids …   New Collegiate Dictionary

  • silicic acid —    H4SiO4 monomeric acid [16] …   Lexicon of Cave and Karst Terminology

  • silicic acid — noun a jellylike substance (hydrated silica) • Hypernyms: ↑acid …   Useful english dictionary

  • silicic acid — noun any of a range of compounds, being hydrates of silica; they form silicates having complex polymeric structures …   Wiktionary

  • silicic acid — noun Chemistry a hydrated form of silica made by acidifying solutions of silicates …   English new terms dictionary

  • silicic acid — See silex …   New dictionary of synonyms