maleic acid
C2Technical/Scientific
Definition
Meaning
An unsaturated, white crystalline dicarboxylic acid (C4H4O4).
An important industrial organic acid used in the production of polymers, resins, and agricultural chemicals, known for its geometric isomerism with fumaric acid.
Linguistics
Semantic Notes
The name derives from 'maleic', relating to 'malic acid', from which it can be formed. It is an isomer, specifically the cis-isomer, of fumaric acid.
Dialectal Variation
British vs American Usage
Differences
No spelling or pronunciation differences. Minor preference for 'cis-butenedioic acid' in some formal UK academic texts.
Connotations
None; strictly a technical term.
Frequency
Equally rare outside chemistry in both regions. Appears in identical specialist contexts.
Vocabulary
Collocations
Grammar
Valency Patterns
[Noun] derived from maleic acid[Verb] using maleic acid as a catalyst[Adjective] maleic acid-basedVocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Usage
Context Usage
Business
In industrial procurement and chemical supply chain documentation.
Academic
In organic chemistry, polymer science, and industrial chemistry papers and textbooks.
Everyday
Virtually never used.
Technical
Core term in chemical engineering, polymer synthesis, and organic synthesis protocols.
Examples
By Part of Speech
verb
British English
- The process maleates the polymer chain.
- They aim to maleinise the compound.
American English
- The reaction maleates the substrate.
- The procedure maleinizes the compound.
adverb
British English
- The compound reacted maleicly.
American English
- The compound reacted maleicly.
Examples
By CEFR Level
- Maleic acid is used to make some plastics.
- The laboratory synthesis produced a small yield of maleic acid.
- Maleic acid and fumaric acid are geometric isomers.
- The isomerization of maleic acid to fumaric acid is catalyzed by thiourea.
- Maleic acid anhydride, derived from maleic acid, is a key monomer for unsaturated polyester resins.
Learning
Memory Aids
Mnemonic
Think 'MALE IC' - imagine a MALE chemist holding ICy crystals of this acid, which is the CIS-isomer.
Conceptual Metaphor
Often discussed in terms of 'molecular geometry' (cis vs. trans) and 'industrial building block'.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid direct transliteration; the correct Russian term is 'малеиновая кислота'. Do not confuse with 'яблочная кислота' (malic acid).
Common Mistakes
- Misspelling as 'malic acid' (a different compound).
- Mispronouncing as /ˈmeɪlɪk/.
Practice
Quiz
Maleic acid is best described as:
FAQ
Frequently Asked Questions
They are geometric isomers; maleic acid is the cis-form and fumaric acid is the trans-form. This affects their physical properties and reactivity.
It is not commonly found in nature in significant amounts. Its isomer, fumaric acid, is found in some plants and fungi. Maleic acid is primarily produced industrially.
Its primary industrial use is to make maleic anhydride, a precursor to polyester resins, plasticizers, coatings, and agricultural chemicals.
Due to its cis-configuration, maleic acid has intramolecular hydrogen bonding which is weaker in the solid state, making it easier for water molecules to disrupt and solvate it compared to the more stable crystal lattice of trans-fumaric acid.