- any of various bases, the hydroxides of the alkali metals and of ammonium, that neutralize acids to form salts and turn red litmus paper blue.
- any of various other more or less active bases, as calcium hydroxide.
- (not in technical use) an alkali metal.
- Obsolete. any of various other compounds, as the carbonates of sodium and potassium.
Origin of alkali
Words nearby alkali
How to use alkali in a sentence
Hydrolysis of polyester is a chemical reaction that occurs when polyesters decompose, it can occur with alkalis and acids, hence the need for stomach acids from a cow’s rumen to potentially dissolve plastics.Microbes found in cow stomachs could help solve our plastic problem|Sara Kiley Watson|July 13, 2021|Popular-Science
Both alkaline and alkali come from the Arabic word “al-qili.”
What appears to be ground glass is only the little crystals or small particles of alkali that have not been dissolved.
He was one of the men to whom alkali is a constant poison, and his lips were always cracked and bleeding.
He had come away in the sour mood of a thirsty man who finds an alkali spring sparkling deceptively under a rock.Cabin Fever|B. M. Bower
Talpers flushed angrily, and then grinned, until his alkali-cracked lips glistened in the lamplight.
Now, cations other than the alkali ions are liable to interfere with tests designed for alkaline or neutral solutions.