alkali: meaning, definition, pronunciation and examples
C1Technical, Scientific, Academic, Some everyday use (e.g., cleaning products).
Quick answer
What does “alkali” mean?
A water-soluble base that neutralizes acids, typically having a bitter taste and giving a soapy, slippery feel in solution.
Audio
Pronunciation
Definition
Meaning and Definition
A water-soluble base that neutralizes acids, typically having a bitter taste and giving a soapy, slippery feel in solution.
Any substance with basic (high pH) chemical properties; in geology, soils or minerals rich in soluble salts, especially of sodium or potassium. Informally, something that counteracts acidity.
Dialectal Variation
British vs American Usage
Differences
Spelling and pronunciation are standard. No significant usage difference, though UK 'chemistry' and US 'chemistry' syllabi may introduce the term at slightly different stages.
Connotations
Neutral/scientific in both. In gardening/agriculture, 'alkaline soil' is more common than 'alkali soil' in everyday UK English.
Frequency
Equally low-frequency in general discourse, but standard in scientific/technical contexts in both varieties.
Grammar
How to Use “alkali” in a Sentence
Alkali + noun (alkali metal, alkali solution)Adjective + alkali (strong alkali, volatile alkali)Verb + alkali (neutralise the alkali, react with an alkali)Vocabulary
Collocations
Examples
Examples of “alkali” in a Sentence
verb
British English
- [No standard verb form. 'Alkalise' is the related verb.]
American English
- [No standard verb form. 'Alkalize' is the related verb.]
adverb
British English
- [No standard adverb form derived directly from 'alkali'. 'Alkaline' is not used as an adverb.]
American English
- [No standard adverb form derived directly from 'alkali'. 'Alkaline' is not used as an adverb.]
adjective
British English
- The soil was far too alkaline for the rhododendrons to thrive.
- They tested the lake's alkaline water.
American English
- The soil was way too alkaline for the blueberries to grow.
- They analyzed the pool's alkaline levels.
Usage
Meaning in Context
Business
Rare, except in chemical manufacturing, cleaning product industries, or agricultural reports (e.g., 'alkali soils reduce crop yield').
Academic
Common in chemistry, geology, environmental science, and engineering texts.
Everyday
Limited to contexts like gardening (soil pH), swimming pool maintenance, or household cleaning products (e.g., 'this cleaner contains alkalis').
Technical
The primary domain. Precise use in chemistry labs, industrial processes, soil science, and metallurgy.
Watch out
Common Mistakes When Using “alkali”
- Mispronouncing as /ælˈkɑː.li/ (alkah-lee).
- Using 'alkaline' and 'alkali' interchangeably as nouns (Alkali is the substance, alkaline is the adjective).
- Confusing 'alkali' (soluble base) with 'base' (broader category). All alkalis are bases, not all bases are alkalis.
FAQ
Frequently Asked Questions
In chemistry, all alkalis are bases, but not all bases are alkalis. An alkali is specifically a base that is soluble in water (e.g., sodium hydroxide). Insoluble bases like copper(II) oxide are not alkalis.
Lye is a common name for a strong alkali, specifically sodium hydroxide (NaOH) or potassium hydroxide (KOH). So, lye is a type of alkali, but 'alkali' is the broader category.
Yes. Baking soda (sodium bicarbonate), washing soda (sodium carbonate), and household ammonia solutions are common, milder alkalis found in homes. Oven cleaners often contain stronger alkalis like sodium hydroxide.
It refers to soil with a high pH (above 7) and often a high concentration of soluble salts, like sodium carbonate. This can be toxic to many plants and is a challenge in agriculture, especially in arid regions.
A water-soluble base that neutralizes acids, typically having a bitter taste and giving a soapy, slippery feel in solution.
Alkali is usually technical, scientific, academic, some everyday use (e.g., cleaning products). in register.
Alkali: in British English it is pronounced /ˈæl.kəl.aɪ/, and in American English it is pronounced /ˈæl.kə.laɪ/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “[No common idioms for 'alkali' as a standalone word]”
Learning
Memory Aids
Mnemonic
Think: 'All allies neutralize acids.' Alkali sounds like 'ally,' and alkalis are bases that counteract (are allies against) acids.
Conceptual Metaphor
ALKALI IS A NEUTRALIZING AGENT / COUNTER-FORCE (e.g., 'The alkali acted to calm the acidic reaction').
Practice
Quiz
Which of the following is NOT a characteristic property of a typical alkali?