water of hydration
C1Technical/Scientific
Definition
Meaning
Water molecules that are chemically bound within a crystal structure.
The water molecules present in a hydrated compound, typically forming part of its crystalline lattice, which can be removed by heating to leave an anhydrous substance.
Linguistics
Semantic Notes
Term is highly specific to chemistry and materials science. It refers specifically to water incorporated into a crystal's molecular framework, not just absorbed moisture.
Dialectal Variation
British vs American Usage
Differences
No significant lexical difference. Both varieties use the same term identically.
Connotations
Purely technical, neutral connotation in both dialects.
Frequency
Extremely rare outside scientific contexts in both varieties.
Vocabulary
Collocations
Grammar
Valency Patterns
The [compound] contains [amount] water of hydration.Heating drives off the water of hydration from the [crystal].Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “Driven off like water of hydration (rare technical simile).”
Usage
Context Usage
Business
Virtually never used.
Academic
Common in chemistry, geology, materials science papers and textbooks.
Everyday
Extremely rare, only in highly specific technical discussions.
Technical
Standard term in chemistry for water molecules integrated into a crystal lattice.
Examples
By CEFR Level
- The blue crystals contain water of hydration, which gives them their colour.
- When you heat copper sulphate, it loses its water of hydration and turns white.
- The stoichiometry was calculated based on the precise mass of water of hydration lost upon heating.
- Thermogravimetric analysis confirmed the compound contained two moles of water of hydration per formula unit.
Learning
Memory Aids
Mnemonic
Imagine a crystal sponge holding water molecules tightly within its structure.
Conceptual Metaphor
WATER IS A STRUCTURAL COMPONENT (within the crystal framework).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not confuse with 'водный раствор' (aqueous solution). The term specifically refers to 'кристаллизационная вода' or 'вода гидратации'.
Common Mistakes
- Using 'water of hydration' to refer to any moisture content (e.g., in food).
- Confusing it with adsorbed surface water.
Practice
Quiz
What does 'water of hydration' specifically refer to?
FAQ
Frequently Asked Questions
No. Moisture content generally refers to loosely held or adsorbed water, while water of hydration is chemically incorporated into the crystal structure.
Not directly as liquid water. It is part of the solid structure. Its presence or removal often changes a crystal's colour or transparency.
Typically by heating the compound to a specific temperature, a process often called 'dehydration' or 'calcination'.
Yes, 'water of crystallization' is a common synonym used interchangeably with 'water of hydration'.