To hear audio pronunciation of this topic, purchase a subscription or log in.

pl. alkalis, alkalies [Ult. fr. Arabic al-qalī, ashes of salt wort]
A strong base, esp. the metallic hydroxides. Alkalies combine with acids to form salts, combine with fatty acids to form soap, neutralize acids, and turn litmus paper blue.
SEE: acid; SEE: base; SEE: pH

There's more to see -- the rest of this topic is available only to subscribers.