nước vôi

Thân thiện

Người ta thường ngâm hạt đậu phộng trong nước vôi trước khi luộc để hạt được trắng và cứng.

Definition

1. Noun:
   • Lime water: A clear, colorless aqueous solution of calcium hydroxide (Ca(OH)₂), formed by mixing quicklime (calcium oxide) with water and allowing the excess solids to settle. It is a mild alkali.
   • Limewash / Whitewash: A traditional, often diluted, mixture of slaked lime (calcium hydroxide) and water used as a cheap, antiseptic paint for coating walls, fences, or tree trunks.

Usage Examples

• Noun (Chemical Solution):

  • Thí nghiệm này yêu cầu sử dụng nước vôi. (This experiment requires the use of lime water.)
  • Nước vôi trở nên đục khi sục khí CO₂ vào. (Lime water turns cloudy when CO₂ gas is bubbled through it.)

• Noun (Coating):

  • Người nông dân quét nước vôi lên gốc cây để ngăn côn trùng. (The farmer applies limewash to the tree trunks to prevent insects.)
  • Bức tường được sơn bằng nước vôi trông rất sạch sẽ. (The wall painted with whitewash looks very clean.)

Advanced Usage

• "nước vôi trong": This specifically refers to the clear, supernatant liquid of lime water, used in cooking (e.g., in making certain traditional candies or stabilizing textures in food) or in precise chemical contexts.
  • Làm mứt dừa cần có nước vôi trong. (Making coconut candy requires clear lime water.)

Variants and Related Words

• Vôi sống (n): Quicklime, calcium oxide (CaO).
• Vôi tôi (n): Slaked lime, calcium hydroxide (Ca(OH)₂) in solid or paste form.

Synonyms

• Lime water: For the chemical solution.
• Whitewash / Limewash: For the coating mixture.

Related Concepts

• Calcium hydroxide: The chemical compound dissolved in lime water.
• Alkaline solution: Describes the basic (non-acidic) nature of lime water.

Học thuật

1. Lime water