Ebullioscopy

Japanese: ebullioscopy

…Because of this property, the molecular weight M of an unknown substance can be determined by dissolving a certain mass w of the unknown substance in a solvent _with known Kb and calculating the boiling point elevation ⊿ T. This method is called ebullioscopy (boiling point method) and has been frequently used to determine molecular weights, along with the cryoscopic method, which uses freezing point depression. However, this formula does not hold for salts such as table salt (NaCl), which dissociate into ions in water, and ⊿ T is generally larger than the calculated value. …

*Some terminology explanations that mention "ebullioscopy" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…この性質のため，未知物質の一定質量wをK_b既知の溶媒に溶かして沸点上昇⊿Tを求めれば，未知物質の分子量Mを決定することができる。この方法は沸点法ebullioscopy(boiling point method)と呼ばれ，凝固点降下を利用した氷点法とともに，よく分子量決定に用いられてきた。ただし，食塩NaClなどの塩類は水中でイオンに解離するので，この式は成立せず，一般に⊿Tは計算値より大きくなる。…

※「ebullioscopy」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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