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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Anhydrous ： ウィキペディア英語版 Anhydrous A substance is anhydrous if it contains no water, for example, salts lacking their water of crystallisation. The way of achieving the anhydrous form differs from one substance to another. ==Solvents== In many cases, the presence of water can prevent a reaction from happening, or it can cause undesirable products to form. To prevent this, anhydrous solvents must be used when performing certain reactions. Examples of reactions requiring the use of anhydrous solvents are the Grignard reaction and the Wurtz reaction. Solvents are commonly rendered anhydrous by boiling them in the presence of a hygroscopic substance; metallic sodium is one of the most common metals used. Other methods include the addition of molecular sieves or alkali bases such as potassium hydroxide or barium oxide. Column solvent purification devices (generally referred to as Grubb's columns) recently became available, reducing the hazards (water reactive substances, heat) from the classical dehydrating methods.〔(Guidelines for solvent purification at UC Davis ) 〕〔(【引用サイトリンク】url=http://chemwiki.ucdavis.edu/Reference/Lab_Techniques/Distillation/Drying_Solvents )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Anhydrous」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.