| 单词 | alkali |
| 释义 | alkali n. (pl. alkalis) 1. a any of a class of substances that liberate hydroxide ions in water, usu. form caustic or corrosive solutions, turn litmus blue, and have a pH of more than 7, e.g. caustic soda. b any other substance with similar but weaker properties, e.g. sodium carbonate. 2. Chem. any substance that reacts with or neutralizes hydrogen ions. Phrases and idioms alkali metals any of the univalent group of metals, lithium, sodium, potassium, rubidium, and caesium, whose hydroxides are alkalis. Derivatives alkalimeter n. alkalimetry n. Etymology: ME f. med.L, f. Arab. al-kali calcined ashes f. kala fry |
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