unslaked lime
RareTechnical
Definition
Meaning
A dry, white, powdery substance consisting of calcium oxide (CaO) that has not been mixed with water.
A highly reactive and caustic chemical used in construction, metallurgy, and chemical processes; also called quicklime or burnt lime.
Linguistics
Semantic Notes
Refers specifically to the form of lime after limestone is heated but before water is added. The term emphasizes the chemical state rather than the substance itself.
Dialectal Variation
British vs American Usage
Differences
The term 'unslaked lime' is used in both varieties, but 'quicklime' is more common. No significant regional difference in meaning.
Connotations
Technical/industrial; implies a specific chemical process or material state.
Frequency
Very low frequency in general language; slightly more likely in UK technical texts, but 'quicklime' dominates in both.
Vocabulary
Collocations
Grammar
Valency Patterns
[unslaked lime] is used for [process][process] requires [unslaked lime]mix [unslaked lime] with [material]Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “None”
Usage
Context Usage
Business
In procurement or manufacturing contexts, e.g., 'The contract specifies a shipment of unslaked lime.'
Academic
In chemistry, materials science, or historical construction texts.
Everyday
Virtually never used; 'lime' typically refers to the fruit.
Technical
Standard term in construction, metallurgy (e.g., steel production), and chemical engineering.
Examples
By Part of Speech
adjective
British English
- The builder warned about the unslaked lime residue.
American English
- They stored the unslaked lime material separately.
Examples
By CEFR Level
- Lime can be unslaked or slaked.
- Unslaked lime is used in making cement.
- The chemical reaction when water is added to unslaked lime produces significant heat.
- Historically, unslaked lime was employed in mortar for its hydraulic properties, though it required careful handling due to its causticity.
Learning
Memory Aids
Mnemonic
Think: UNSLAKED = UN-quenched, like a thirst. It's lime that hasn't had its 'thirst' for water quenched.
Conceptual Metaphor
Chemical 'thirst' (unslaked = unquenched).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not translate as 'негашёная известь' for general 'lime' (fruit) which is 'лайм'. The chemical term is correct.
Common Mistakes
- Using 'unslaked lime' to refer to agricultural lime (which is different). Confusing it with 'slaked lime' (the safe, hydrated form).
Practice
Quiz
What is the primary chemical component of unslaked lime?
FAQ
Frequently Asked Questions
Yes, it is highly caustic and can cause severe chemical burns. It reacts violently with water, releasing heat.
Unslaked lime (CaO) is calcium oxide. Slaked lime (Ca(OH)2) is calcium hydroxide, produced by adding water to unslaked lime.
No, it is too caustic and reactive. Gardeners use agricultural lime (crushed limestone) or slaked/hydrated lime.
'Quick' here is an old term meaning 'living' or 'reactive', referring to its vigorous chemical activity when mixed with water.