This refers to oxides that are basic, and generally become bases when they react with water, and produce salts when they react with acids. Examples are oxides of metals, particularly non-transition elements with high electropositive potential, or transition metal elements with low valences. For example, calcium oxide, CaO, is a typical basic oxide, and when it reacts with water it becomes calcium hydroxide, Ca(OH) 2 , which is a base, and when it reacts with an acid, such as hydrochloric acid, it forms calcium chloride, CaCl2, which is a salt. [Nakahara Katsunori] Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend |
酸化物のうち塩基性であるものをいい、一般に水と反応すると塩基となり、酸と反応すれば塩を生ずる。金属とくに陽性の大きい非遷移元素あるいは低原子価状態の遷移金属元素の酸化物がそうである。たとえば、カルシウムの酸化物である酸化カルシウムCaOは典型的な塩基性酸化物であり、水と反応すると塩基である水酸化カルシウムCa(OH)2となり、酸たとえば塩酸と反応すると塩である塩化カルシウムCaCl2をつくる。 [中原勝儼] 出典 小学館 日本大百科全書(ニッポニカ)日本大百科全書(ニッポニカ)について 情報 | 凡例 |
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