aqua regia: meaning, definition, pronunciation and examples
Very LowTechnical/Scientific, Literary (metaphoric)
Quick answer
What does “aqua regia” mean?
A highly corrosive mixture of concentrated nitric acid and concentrated hydrochloric acid, typically in a 1:3 molar ratio, capable of dissolving gold and platinum.
Audio
Pronunciation
Definition
Meaning and Definition
A highly corrosive mixture of concentrated nitric acid and concentrated hydrochloric acid, typically in a 1:3 molar ratio, capable of dissolving gold and platinum.
A metaphor or idiom for something with the power to dissolve or break down formidable, resistant, or 'noble' structures, whether physical, social, or intellectual.
Dialectal Variation
British vs American Usage
Differences
No significant differences in meaning, spelling, or pronunciation. The term is identical in both varieties due to its Latin origin and technical nature.
Connotations
Identical technical connotations. Potential metaphoric use is equally rare in both varieties.
Frequency
Extremely low frequency in general discourse, confined almost exclusively to chemistry contexts. Equal frequency in UK and US academic/technical writing.
Grammar
How to Use “aqua regia” in a Sentence
[Subject] dissolves in aqua regia.Aqua regia is used to dissolve [Object].[Chemist] prepared aqua regia by mixing [Acids].Vocabulary
Collocations
Examples
Examples of “aqua regia” in a Sentence
verb
British English
- The residue was then aqua regia digested overnight.
- We need to aqua-regia that plating to recover the gold.
American English
- The chip was aqua regia treated to remove the gold leads.
- They aqua regia'd the metal sample for analysis.
adjective
British English
- The aqua-regia solution must be prepared in a fume cupboard.
- An aqua-regia digest was performed.
American English
- The aqua regia mixture was highly fuming.
- Follow the aqua-regia dissolution protocol.
Usage
Meaning in Context
Business
Virtually never used. A forced metaphor might be 'a corporate strategy acting as an aqua regia on market barriers.'
Academic
Used almost exclusively in chemistry, materials science, and metallurgy textbooks and papers. E.g., 'The sample was digested using aqua regia.'
Everyday
Extremely rare. Likely only in the context of crime fiction (dissolving evidence) or educational documentaries.
Technical
Standard term in analytical chemistry, gold refining, and microelectronics for cleaning or dissolving precious metals.
Vocabulary
Synonyms of “aqua regia”
Neutral
Weak
Vocabulary
Antonyms of “aqua regia”
Watch out
Common Mistakes When Using “aqua regia”
- Mispronouncing 'regia' as /ˈrɛdʒə/ or /ˈreɪɡɪə/. Correct is /ˈriːdʒə/.
- Misspelling as 'aqua regiae' or 'aqua regal'.
- Incorrectly stating the acid ratio (it's typically 1:3 HNO₃:HCl by volume).
FAQ
Frequently Asked Questions
No. While it dissolves gold, platinum, palladium, and some other metals, it does not dissolve all. For example, metals like titanium, tantalum, and silver chloride are resistant. Silver forms an insoluble chloride layer.
Absolutely not. It is extremely corrosive, produces toxic fumes (chlorine, nitrosyl chloride), and is a powerful oxidizer. Its preparation and use should only be conducted by trained professionals in a controlled laboratory setting with appropriate safety measures.
It was given this name by alchemists in the Middle Ages because of its unique ability to dissolve the 'royal' or 'noble' metals—gold and platinum—which were associated with royalty and resisted corrosion by other chemicals.
No. It is unstable and decomposes over time, losing its potency as chlorine gas escapes. It is typically prepared fresh just before use for maximum effectiveness.
A highly corrosive mixture of concentrated nitric acid and concentrated hydrochloric acid, typically in a 1:3 molar ratio, capable of dissolving gold and platinum.
Aqua regia is usually technical/scientific, literary (metaphoric) in register.
Aqua regia: in British English it is pronounced /ˌækwə ˈriːdʒə/, and in American English it is pronounced /ˌɑːkwə ˈriːdʒə/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “an aqua regia for bureaucracy (metaphoric, rare)”
- “like applying aqua regia to a problem (metaphoric, rare)”
Learning
Memory Aids
Mnemonic
Imagine a REGIAl (royal) crown made of gold being dropped into AQUA (water). The crown dissolves because this is no ordinary water—it's the royal water that eats kings (of metals).
Conceptual Metaphor
POWER IS CORROSIVE LIQUID / A FORMIDABLE PROBLEM-SOLVER IS A DISSOLVING AGENT.
Practice
Quiz
What is the primary reason aqua regia can dissolve gold?