羧基的 化學式 為-C (=O)OH，通常寫成-COOH或-CO 2 H，它是由一個 羰 tāng 基 [1] （>C=O）和一個 羥 qiǎng 基 [4] （-O-H）組成的複合 官能基。 羧酸是 質子 （H +）授予者，也就是 質子酸 （布-洛酸）。 可分為 脂肪酸 及 芳香酸 二大類。 螞蟻 和 蜜蜂 的分泌液中含的 甲酸 H-COOH、使 醋 有 酸味 的 乙酸 CH 3 -COOH...等都是常見的羧酸。 擁有兩個羧基的分子叫二酸，最簡單的分子是由兩個羧基結合而成的 草酸 (COOH) 2。 其他像是可在 檸檬 中發現的 檸檬 …

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2012年12月10日 · 碱性：溶液中存在大量氢氧根，会与电离出的氢离子结合，促进-cooh的电离，所以-cooh主要以-coo- 负离子的形式存在。 -COONa在溶液中完全电离，酸性溶液中-COO- 负离子会与氢离子结合并难再电离出来，故以-COOH存在；中性以-COO- 负离子存在；碱性-COO- 负 …

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