hydrazoic acid
C2 / Extremely Rare (Specialist Technical)Highly technical, scientific, academic chemistry/engineering.
Definition
Meaning
a highly toxic, explosive, and volatile inorganic acid with the chemical formula HN₃.
It is a colorless liquid used in organic synthesis and as a propellant in airbags; its salts (azides) are common in chemistry and are used as detonators.
Linguistics
Semantic Notes
Refers strictly to the chemical compound HN₃. Often discussed in contexts of its properties (toxicity, explosiveness), synthesis, or its salts (metal azides like sodium azide). Not used in general language.
Dialectal Variation
British vs American Usage
Differences
No significant differences in meaning or usage. Spelling is consistent.
Connotations
Connotes danger, specialized laboratory work, and explosive chemistry in both dialects.
Frequency
Extremely low frequency in both, confined to advanced technical texts.
Vocabulary
Collocations
Grammar
Valency Patterns
[Substance] reacts with hydrazoic acid to form [Product].Hydrazoic acid is used in the synthesis of [Compound].The [Property] of hydrazoic acid requires careful handling.Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Usage
Context Usage
Business
Virtually never used. Potential mention in highly specific industrial chemical supply or safety regulation contexts.
Academic
Primary context. Used in advanced chemistry textbooks, research papers on nitrogen chemistry, and lectures on explosive or toxic compounds.
Everyday
Never used.
Technical
Core context. Used in chemical engineering, propellant design, organic synthesis protocols, and hazardous material safety sheets (MSDS).
Examples
By Part of Speech
adjective
British English
- The hydrazoic acid solution was prepared under nitrogen.
- Researchers studied the hydrazoic acid decomposition pathway.
American English
- The hydrazoic acid concentration was critical for the reaction.
- Safety protocols for hydrazoic acid handling are stringent.
Examples
By CEFR Level
- Hydrazoic acid is a dangerous chemical used in special labs.
- Car airbags can use a salt related to hydrazoic acid.
- The organic synthesis required the in situ generation of hydrazoic acid from sodium azide and a strong acid.
- Due to its high vapour pressure and toxicity, hydrazoic acid must be handled in an efficient fume cupboard.
Learning
Memory Aids
Mnemonic
Imagine a HYDRA (many-headed monster) with AZ (from 'azide', sounding like 'haze') and a bottle of ACID. A monstrous, hazy, dangerous acid.
Conceptual Metaphor
DANGER IS A VOLATILE LIQUID; SYNTHESIS IS A PRECISE DANCE.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not confuse with 'азотистая кислота' (nitrous acid, HNO₂). 'Hydrazoic acid' is 'азотистоводородная кислота' or 'азид водорода' (HN₃).
Common Mistakes
- Mispronouncing 'hydrazoic' as /haɪˈdræzɪk/.
- Confusing it with 'hydrozoic' (which is incorrect).
- Using it in non-chemical contexts.
- Misspelling as 'hydrazonic acid' (a different class of compound).
Practice
Quiz
What is a primary industrial use for salts derived from hydrazoic acid?
FAQ
Frequently Asked Questions
No, they are completely different. Hydrochloric acid (HCl) is a common, strong acid. Hydrazoic acid (HN₃) is a toxic, explosive acid containing nitrogen.
It is dangerous due to a combination of high toxicity (similar to cyanide), volatility (it boils just above room temperature), and explosive nature when concentrated or shocked.
'Azide' refers to the anion N₃⁻ or salts containing it (e.g., sodium azide, NaN₃). Hydrazoic acid is the conjugate acid of the azide ion. Sodium azide is a common, more stable source of the azide group.
Almost certainly not. Due to its significant hazards, it is only handled in specialised research or industrial laboratories with appropriate safety infrastructure and expertise.