Salah satu kelas persenyawaan yang membentuk sabun yang dapat larut dalam asam lemak, mengubah litmus merah menjadi biru, dan membentuk karbonat yang dapat larut, misalnya hidroksida atau karbonat dari kalium atau natrium.
|This article needs additional citations for verification. (June 2008) (Learn how and when to remove this template message)|
In chemistry, an alkali (//; from Arabic: al-qaly القلي, القالي , “ashes of the saltwort”) is a basic, ionic salt of an alkali metal or alkaline earth metal chemical element. An alkali also can be defined as a base that dissolves in water. A solution of a soluble base has a pH greater than 7.0. The adjective alkaline is commonly, and alkalescent less often, used in English as a synonym for basic, especially for bases soluble in water. This broad use of the term is likely to have come about because alkalis were the first bases known to obey the Arrhenius definition of a base, and they are still among the most common bases.