Plural of alkali

regular plural

The plural of alkali is alkalis or alkalies.

Forms of alkali

ABS materials are however susceptible to chemical attacks by chlorinated solvents, esters, ketines, acids and alkalis.2013, Roy D Cullum, Handbook of Engineering Design, →ISBN, page 40. From the entry ketine
It is characteristically burning and has a belchy feel because belching and alkalies relieve it.1944, Journal of the Missouri State Medical Association: Volume 41. From the entry belchy
Liquids in intimate contact with metals, such as seawater, acids alkides and alkalies, are serious corroders for a large variety of metals and alloys.2006, Zaki Ahmad, Principles of Corrosion Engineering and Corrosion Control, page 481. From the entry corroder

noun One of a class of caustic bases, such as soda, soda ash, caustic soda, potash, ammonia, and lithia, whose distinguishing characteristics are dissolving in alcohol and water, uniting with oils and fats to form soap, neutralizing and forming salts with acids, turning to brown several vegetable yellows, and changing reddened litmus to blue.
noun Soluble mineral matter, other than common salt, contained in soils of natural waters.

What is the plural of alkali?: The plural of alkali is alkalis or alkalies.
Which is correct, alkalis or alkalies?: Both are used. alkalis is the more common of the two in English writing.
Is alkali countable?: Alkali is a countable and uncountable noun.

Adapted from Wiktionary: alkali (page history and authors) and the entries of its forms. Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws left out forms marked obsolete, archaic, rare or dialectal and added the examples. Wiktionary data of 2026-09-02.

Last updated: 2026-09-02

Cite this page: “Plural of alkali.” Word.ws, https://word.ws/plural/alkali. Based on Wiktionary, CC BY-SA 4.0.