oxalic acid
C1+Technical / Scientific
Definition
Meaning
A strong organic acid found in some plants, used industrially and known for forming insoluble salts (oxalates).
In biochemistry and medicine, it is associated with kidney stone formation (calcium oxalate) and is a metabolic product. In household contexts, it is a cleaning and bleaching agent.
Linguistics
Semantic Notes
Primarily a technical term in chemistry, biology, and medicine. In everyday contexts, it is often referenced indirectly via its effects (e.g., 'foods high in oxalates').
Dialectal Variation
British vs American Usage
Differences
No significant lexical differences. Spelling remains 'oxalic acid'. Potential minor pronunciation variance in the first syllable.
Connotations
Neutral scientific term in both varieties. May have a slight negative connotation in dietary/health contexts due to link with kidney stones.
Frequency
Equally low-frequency in general discourse but standard in relevant scientific fields in both regions.
Vocabulary
Collocations
Grammar
Valency Patterns
[SUBJ: Acid] reacts with [OBJ: metal][SUBJ: Compound] contains [OBJ: oxalic acid][SUBJ: Treatment] involves [OBJ: oxalic acid]Vocabulary
Synonyms
Strong
Neutral
Vocabulary
Antonyms
Usage
Context Usage
Business
In commerce of cleaning products or specialty chemicals.
Academic
Standard in chemistry, biochemistry, food science, and medical literature.
Everyday
Rare, except in specific health/nutrition discussions about kidney stones or 'antinutrients' in food.
Technical
Precise term in chemical formulas, safety data sheets, and industrial processes.
Examples
By Part of Speech
adjective
British English
- The oxalic acid concentration was measured.
- Oxalic acid decolorisation is a common treatment for stained wood.
American English
- The oxalic acid content in spinach is notable.
- An oxalic acid solution was used to clean the mineral deposit.
Examples
By CEFR Level
- Some vegetables contain oxalic acid.
- Do not eat rhubarb leaves because they have oxalic acid.
- Oxalic acid can be used to remove rust stains from fabrics.
- A diet very high in oxalic acid may contribute to kidney stones in susceptible individuals.
- The chelating properties of oxalic acid make it effective in metal cleaning applications.
- Calcium oxalate, the insoluble salt of oxalic acid, is the primary constituent of most human kidney stones.
Learning
Memory Aids
Mnemonic
Think of OXALIC: an OX eats plants (like rhubarb leaves) that can contain this ACID.
Conceptual Metaphor
A BINDING AGENT (forms crystalline 'stones'); A CLEANSER (its bleaching action).
Watch out
Common Pitfalls
Common Mistakes
- Pronouncing it as /ˈɒksəlɪk/ (like 'ox'). Correct stress is on the second syllable: /ɒkˈsælɪk/.
- Using 'oxalic' as a noun (e.g., 'an oxalic'). It is only an adjective modifying 'acid'.
- Confusing 'oxalate' (the salt) with 'oxalic acid' (the parent compound).
Practice
Quiz
What is a primary health concern associated with excessive dietary oxalic acid?
FAQ
Frequently Asked Questions
Yes, in concentrated form it is toxic and corrosive. However, the amounts found naturally in foods are generally safe for most people, though excessive consumption can pose health risks.
Spinach, rhubarb, beet greens, Swiss chard, certain nuts (e.g., almonds, cashews), and cocoa powder are notable sources.
It is used as a bleaching agent, in rust removal, as a mordant in dyeing, and in certain chemical synthesis processes.
Oxalic acid is the molecular compound (H₂C₂O₄). Oxalate refers to the anion (C₂O₄²⁻) or its salts (e.g., calcium oxalate).