hydrated lime
Definition
Noun: - A dry, white powder consisting primarily of calcium hydroxide, produced by treating quicklime (calcium oxide) with water. It is a caustic substance with alkaline properties.
Usage
- General Use: Refers to the chemical compound used in construction, water treatment, and various industrial processes.
- Technical/Industrial Use: Specifically denotes the slaked form of lime, chemically known as calcium hydroxide (Ca(OH)₂).
Examples
- The mason mixed hydrated lime with sand to make traditional mortar.
- To adjust the pH of the soil, the gardener applied hydrated lime.
- Hydrated lime is used in the treatment of drinking water and wastewater.
Advanced Usage
- In Chemistry: The term specifies the product of the exothermic reaction: CaO (quicklime) + H₂O → Ca(OH)₂ (hydrated lime) + heat.
- As a Reagent: In laboratories, it is a common reagent for detecting carbon dioxide, as it turns milky when CO₂ is bubbled through its solution (limewater).
Variants and Related Words
- Slaked lime: A direct synonym for hydrated lime.
- Calcium hydroxide: The systematic chemical name.
- Pickling lime: A food-grade form of hydrated lime used in pickling.
- Limewater: A saturated aqueous solution of calcium hydroxide.
- Quicklime (Calcium oxide): The precursor material from which hydrated lime is made.
Synonyms
- Slaked lime
- Calcium hydroxide
- Caustic lime
- Builders' lime
Notes on Meaning
While "hydrated lime" is the standard industrial term, in specific contexts like food preparation or historical building techniques, the synonyms "slaked lime" or "pickling lime" may be preferred. All refer to the same chemical compound, Ca(OH)₂.
Noun
-
a caustic substance produced by heating limestone
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