sulfur trioxide: meaning, definition, pronunciation and examples
C2Technical/Scientific
Quick answer
What does “sulfur trioxide” mean?
A chemical compound with the formula SO₃, formed by the oxidation of sulfur dioxide.
Audio
Pronunciation
Definition
Meaning and Definition
A chemical compound with the formula SO₃, formed by the oxidation of sulfur dioxide.
A highly reactive, corrosive compound that exists in several polymeric forms and is a key intermediate in the production of sulfuric acid.
Dialectal Variation
British vs American Usage
Differences
Spelling: 'sulphur trioxide' (UK) vs. 'sulfur trioxide' (US). The chemical symbol SO₃ is universal.
Connotations
Identical technical connotations in both varieties.
Frequency
Equally frequent in scientific texts in both regions, with spelling being the sole distinction.
Grammar
How to Use “sulfur trioxide” in a Sentence
Sulfur trioxide reacts with [water/compound].The catalyst promotes the oxidation of SO₂ to sulfur trioxide.[Compound] is treated with sulfur trioxide.Vocabulary
Collocations
Examples
Examples of “sulfur trioxide” in a Sentence
verb
British English
- The process sulphonates the compound using sulphur trioxide.
- The gas was carefully sulphonated.
American English
- The process sulfonates the compound using sulfur trioxide.
- The gas was carefully sulfonated.
adverb
British English
- The reaction proceeded sulphur-trioxide-like, with rapid fuming.
American English
- The reaction proceeded sulfur-trioxide-like, with rapid fuming.
adjective
British English
- The sulphur-trioxide-based process is efficient.
- They installed sulphur trioxide scrubbers.
American English
- The sulfur-trioxide-based process is efficient.
- They installed sulfur trioxide scrubbers.
Usage
Meaning in Context
Business
Discussed in the context of chemical supply chains, industrial safety, and manufacturing costs for sulfuric acid.
Academic
Central to studies in inorganic chemistry, atmospheric chemistry, and chemical engineering processes.
Everyday
Virtually never used in everyday conversation outside specific technical discussions.
Technical
The primary context. Used in research papers, safety data sheets, plant operating manuals, and chemical process descriptions.
Vocabulary
Synonyms of “sulfur trioxide”
Vocabulary
Antonyms of “sulfur trioxide”
Watch out
Common Mistakes When Using “sulfur trioxide”
- Misspelling as 'sulphur trioxide' in US contexts or 'sulfur trioxide' in UK academic writing where local spelling conventions are enforced.
- Confusing it with sulfur dioxide (SO₂), a different compound with distinct properties.
- Using 'sulfur trioxide' to refer to oleum (fuming sulfuric acid), which is a solution of SO₃ in sulfuric acid.
FAQ
Frequently Asked Questions
No. Sulfur trioxide (SO₃) is the anhydride of sulfuric acid (H₂SO₄). Sulfuric acid is formed when SO₃ reacts with water.
It is highly corrosive, reacts violently with water releasing immense heat, and fumes in air to form corrosive sulfuric acid mists.
Sulfur dioxide (SO₂) has one sulfur and two oxygen atoms. Sulfur trioxide (SO₃) has one sulfur and three oxygen atoms. SO₂ is a gas involved in pollution and wine preservation, while SO₃ is a key intermediate for making sulfuric acid.
It is often handled as a liquid under pressure or, more commonly, immediately converted to or transported as oleum (fuming sulfuric acid) or sulfuric acid for safety and practicality.
A chemical compound with the formula SO₃, formed by the oxidation of sulfur dioxide.
Sulfur trioxide is usually technical/scientific in register.
Sulfur trioxide: in British English it is pronounced /ˌsʌl.fə traɪˈɒk.saɪd/, and in American English it is pronounced /ˌsʌl.fɚ traɪˈɑːk.saɪd/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “None. This is a technical term with no idiomatic usage.”
Learning
Memory Aids
Mnemonic
Think 'Tri' for three oxygen atoms bonded to one sulfur atom: S-O₃.
Conceptual Metaphor
Often metaphorically described as a 'hungry' or 'aggressive' molecule due to its strong electrophilic nature and violent reaction with water.
Practice
Quiz
What is the primary industrial use of sulfur trioxide?