Orthosilicic acid - Ortokeisan

Japanese: オルトケイ酸 - おるとけいさん
Orthosilicic acid - Ortokeisan

…Usually referring to orthosilicic acid, H 4 SiO 4 , it can also be used as a general term to include metasilicic acid (H 2 SiO 3 ) n and various other forms of acid, or amorphous hydrated silicon dioxide, represented by x SiO 2y H 2 O. Orthosilicic acid can be obtained as a colorless powder by hydrolyzing silicon tetrahalide or treating alkali orthosilicate with hydrochloric acid, washing the product with ether, benzene, etc., and drying it, but it is difficult to obtain pure H 4 SiO 4 , and H 2 SiO 3 , H 2 Si 2 O 5 , etc. are mixed in. …

*Some of the terminology explanations that mention "orthosilicic acid" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…ふつうはオルトケイ酸H4SiO4を指すが,メタケイ酸(H2SiO3)nのほか各種の形式の酸,あるいはxSiO2yH2Oであらわされる無定形不定組成の水和二酸化ケイ素を含めた総称として用いられることもある。オルトケイ酸は,四ハロゲン化ケイ素を加水分解するか,オルトケイ酸アルカリを塩酸で処理し,生成物をエーテル,ベンゼンなどで洗浄し乾燥すると無色粉末状の化合物として得られるが,純粋にH4SiO4のみを得るのはむずかしく,H2SiO3,H2Si2O5などが混入する。…

※「オルトケイ酸」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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