thiosulfuric acid: meaning, definition, pronunciation and examples
C2 (Proficient User - Specialized Technical)Formal, Technical, Scientific
Quick answer
What does “thiosulfuric acid” mean?
An unstable inorganic acid, H₂S₂O₃, where one oxygen atom in sulfuric acid is replaced by a sulfur atom.
Audio
Pronunciation
Definition
Meaning and Definition
An unstable inorganic acid, H₂S₂O₃, where one oxygen atom in sulfuric acid is replaced by a sulfur atom.
An important intermediate in various chemical processes, including photographic fixing (hypo) and analytical chemistry, though it is typically not isolated due to its instability and exists in solution or as its salts (thiosulfates).
Dialectal Variation
British vs American Usage
Differences
Spelling and usage are identical. The term is confined to specialized chemistry contexts in both varieties.
Connotations
No regional connotations; purely technical.
Frequency
Extremely low frequency in general language, appearing almost exclusively in advanced chemistry textbooks, research papers, and technical manuals.
Grammar
How to Use “thiosulfuric acid” in a Sentence
[Compound] is formed by [process].[Compound] decomposes into [products].The salts of [compound] are known as thiosulfates.Vocabulary
Collocations
Examples
Examples of “thiosulfuric acid” in a Sentence
adjective
British English
- The thiosulfuric acid pathway is central to the mechanism.
- They studied the thiosulfuric acid derivative.
American English
- The thiosulfuric acid pathway is key to the mechanism.
- They analyzed the thiosulfuric acid derivative.
Usage
Meaning in Context
Business
Virtually never used.
Academic
Used in advanced university-level chemistry courses and research publications in inorganic and analytical chemistry.
Everyday
Never used.
Technical
Used in chemical manufacturing patents, analytical chemistry protocols, and materials science research concerning sulfur chemistry.
Vocabulary
Synonyms of “thiosulfuric acid”
Neutral
Vocabulary
Antonyms of “thiosulfuric acid”
Watch out
Common Mistakes When Using “thiosulfuric acid”
- Mispronouncing 'thio-' as /θiːoʊ/ instead of /θaɪoʊ/.
- Confusing it with thiosulfate salts, which are stable and common.
- Misspelling as 'thiosulphuric' (though 'sulfuric/sulphuric' variation is accepted, 'thio-' is standard).
FAQ
Frequently Asked Questions
No, it is too unstable to be stored or sold commercially. Its salts (thiosulfates), however, like sodium thiosulfate ('hypo'), are stable and commonly available.
Its primary importance lies in its anion, the thiosulfate ion (S₂O₃²⁻), which is crucial in photography, gold extraction, iodometric titrations, and as an antidote for cyanide poisoning.
It is structurally analogous to sulfuric acid (H₂SO₄) but with one of the four oxygen atoms replaced by a sulfur atom, resulting in H₂S₂O₃.
Almost certainly not. It is highly specialized technical vocabulary known only to chemists, chemical engineers, and advanced students in the field.
An unstable inorganic acid, H₂S₂O₃, where one oxygen atom in sulfuric acid is replaced by a sulfur atom.
Thiosulfuric acid is usually formal, technical, scientific in register.
Thiosulfuric acid: in British English it is pronounced /ˌθaɪəʊsʌlˈfjʊərɪk ˈæsɪd/, and in American English it is pronounced /ˌθaɪoʊsʌlˈfjʊrɪk ˈæsɪd/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Think 'THIO' for 'sulfur' replacing oxygen, plus 'SULFURIC ACID' – it's the sulfur version of sulfuric acid.
Conceptual Metaphor
A chemical 'cousin' or 'variant' of a familiar substance (sulfuric acid), created by a direct atomic substitution.
Practice
Quiz
What does the prefix 'thio-' signify in 'thiosulfuric acid'?