Is cyanic acid dangerous?

Yes, it is toxic and unstable, requiring careful handling in a controlled laboratory environment.

What is the difference between cyanic acid and hydrocyanic acid?

They are completely different compounds. Cyanic acid is HOCN, while hydrocyanic acid (prussic acid) is HCN. They have different structures, properties, and toxicities.

Where would I encounter the term 'cyanic acid'?

Almost exclusively in university-level chemistry education, chemical research literature, or in industrial contexts involving specialty chemicals like cyanate esters.

cyanic acid

Low

UK/saɪˌæn.ɪk ˈæs.ɪd/US/saɪˌæn.ɪk ˈæs.ɪd/

Technical/Scientific

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Definition

Meaning

A toxic, unstable chemical compound with the formula HOCN.

A chemical intermediate in certain industrial processes and a precursor to related cyanate compounds.

Linguistics

Semantic Notes

Refers specifically to a tautomeric compound, distinct from isocyanic acid. Commonly referenced as a solution or theoretical entity in chemistry.

Dialectal Variation

British vs American Usage

Differences

No significant differences in use or spelling. Differences may appear in secondary terms like 'lab' (US) vs. 'laboratory' (UK), but 'cyanic acid' is invariant.

Connotations

Purely scientific/technical term in both varieties. No cultural connotations.

Frequency

Equal, very low frequency outside specialised chemistry contexts.

Vocabulary

Collocations

strong

solution of cyanic acidformation of cyanic acidsalt of cyanic acidhydrolysis yields cyanic acid

medium

unstable cyanic acidtoxic cyanic acidprepare cyanic acidaqueous cyanic acid

weak

pure cyanic acidhandling cyanic acidreaction with cyanic acid

Grammar

Valency Patterns

the acid is formed bythe polymerisation of cyanic acid yieldsX reacts with cyanic acid to produce Y

Vocabulary

Synonyms

Neutral

HOCN

Weak

cyanic acid solution

Vocabulary

Antonyms

isocyanic acid

Usage

Context Usage

Business

Not used.

Academic

Used in advanced chemistry textbooks and research papers discussing reaction mechanisms, tautomerism, or polymerisation.

Everyday

Virtually never used.

Technical

Used in specialised chemical literature, material science (e.g., cyanate ester resins), and laboratory manuals.

Examples

By Part of Speech

adjective

British English

The cyanic acid derivative showed unexpected stability.
Researchers studied the cyanic acid pathway.

American English

The cyanic acid compound was highly reactive.
They analyzed the cyanic acid byproduct.

Examples

By CEFR Level

Cyanic acid is mentioned in some advanced chemistry courses.
The formation of cyanic acid was a key step in the experiment.

The tautomeric equilibrium between cyanic and isocyanic acid was studied using spectroscopy.
Cyanic acid polymerises readily to form cyanuric acid under certain conditions.

Learning

Memory Aids

Mnemonic

Remember 'CYAN' as in cyanide (related nitrogen-carbon chemistry) and 'IC ACID' as a type of acid. Cyan + ic + acid.

Watch out

Common Pitfalls

Translation Traps (for Russian speakers)

Do not confuse with 'синильная кислота' (hydrocyanic acid, HCN). 'Cyanic acid' is 'циановая кислота' (HOCN).
Note the different chemical formulas and properties.

Common Mistakes

Misspelling as 'cyannic acid'.
Confusing it with hydrocyanic acid (prussic acid).
Incorrectly assuming it is a common, stable laboratory reagent.

Practice

Quiz

Fill in the gap

Under acidic conditions, the cyanate salt can protonate to form .

Multiple Choice

What is the primary context for the term 'cyanic acid'?

FAQ

Frequently Asked Questions

: Yes, it is toxic and unstable, requiring careful handling in a controlled laboratory environment.
: They are completely different compounds. Cyanic acid is HOCN, while hydrocyanic acid (prussic acid) is HCN. They have different structures, properties, and toxicities.
: No, it is a weak acid.
: Almost exclusively in university-level chemistry education, chemical research literature, or in industrial contexts involving specialty chemicals like cyanate esters.