sodium hydroxide: meaning, definition, pronunciation and examples
Low-frequency outside technical/chemical contextsTechnical/Scientific
Quick answer
What does “sodium hydroxide” mean?
A strongly alkaline chemical compound with the formula NaOH, commonly known as caustic soda or lye.
Audio
Pronunciation
Definition
Meaning and Definition
A strongly alkaline chemical compound with the formula NaOH, commonly known as caustic soda or lye.
A white solid ionic compound used extensively in industry and laboratories as a strong base, reagent, pH regulator, and cleaning agent.
Dialectal Variation
British vs American Usage
Differences
No major lexical differences; both use 'sodium hydroxide' as the standard chemical term. In domestic contexts, 'caustic soda' is equally common in both varieties; 'lye' is somewhat more frequent in American English for soap-making contexts.
Connotations
Neutral technical term in both varieties; carries strong connotations of hazard and corrosiveness.
Frequency
Equally low in general discourse, equally high in scientific/industrial discourse.
Grammar
How to Use “sodium hydroxide” in a Sentence
[substance] + reacts with + sodium hydroxidesodium hydroxide + is used to + [base action]add + sodium hydroxide + to + [substance]dissolve + [substance] + in + sodium hydroxideVocabulary
Collocations
Examples
Examples of “sodium hydroxide” in a Sentence
verb
British English
- The mixture was sodium-hydroxided to adjust the pH.
- (Note: very rare/non-standard; standard phrasing: 'treated with sodium hydroxide')
American English
- They sodium-hydroxided the solution before testing.
- (Note: very rare/non-standard)
adjective
British English
- A sodium-hydroxide solution was prepared.
- The sodium-hydroxide concentration was critical.
American English
- The sodium-hydroxide treatment was effective.
- Follow sodium-hydroxide safety protocols.
Usage
Meaning in Context
Business
Referenced in chemical supply, manufacturing (soap, paper, textiles), and safety data sheets.
Academic
Common in chemistry textbooks, lab manuals, and research papers discussing bases, saponification, or neutralization reactions.
Everyday
Rare; might appear in DIY cleaning or soap-making instructions as 'caustic soda'.
Technical
Precise term in chemical engineering, industrial processes, laboratory protocols, and hazard communication.
Vocabulary
Synonyms of “sodium hydroxide”
Vocabulary
Antonyms of “sodium hydroxide”
Watch out
Common Mistakes When Using “sodium hydroxide”
- Pronouncing 'hydroxide' with stress on first syllable (/ˈhaɪ.drɒk.saɪd/) instead of second (/haɪˈdrɒk.saɪd/).
- Using 'sodium hydrate' (archaic/incorrect).
- Confusing with sodium bicarbonate (baking soda).
FAQ
Frequently Asked Questions
Yes, it is highly corrosive and can cause severe chemical burns. Proper safety equipment (gloves, goggles) is essential when handling it.
Sodium hydroxide (NaOH) is a strong base (caustic soda). Baking soda is sodium bicarbonate (NaHCO₃), a much milder compound used in cooking and as a gentle cleaner.
Yes, in some drain cleaners or oven cleaners, often labelled as 'caustic soda' or 'lye'. Pure forms are sold for soap-making or industrial use.
It reacts with fats or oils in a process called saponification, breaking them down into soap (fatty acid salts) and glycerol.
A strongly alkaline chemical compound with the formula NaOH, commonly known as caustic soda or lye.
Sodium hydroxide is usually technical/scientific in register.
Sodium hydroxide: in British English it is pronounced /ˌsəʊ.di.əm haɪˈdrɒk.saɪd/, and in American English it is pronounced /ˌsoʊ.di.əm haɪˈdrɑːk.saɪd/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “None specific to this term”
Learning
Memory Aids
Mnemonic
Think 'SODium HydrOXide' – it's a SOap-making, Drain-cleaning OXidizing base.
Conceptual Metaphor
Often conceptualized as a 'chemical scavenger' (for acids) or a 'corrosive cleaner'.
Practice
Quiz
What is a common domestic name for sodium hydroxide?