water of hydration

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water of hydration

A student observes the water of hydration leaving a blue crystal as it is heated.

Definition
  1. Noun:
    • The water present in hydrated compounds: "Water of hydration" refers to water molecules that are chemically bound within the crystalline structure of a salt or other compound, forming a hydrate. This water can often be removed by heating, leaving the anhydrous (water-free) form of the compound.
Usage
  • "Water of hydration" is a technical term used primarily in chemistry and materials science. It is used to specify the water content integral to a hydrate's formula and structure.
  • It is typically used in contexts discussing chemical formulas, stoichiometry, thermal analysis, and the properties of crystalline solids.
Examples
  • Noun:
    • The formula CuSO₄·5H₂O indicates there are five molecules of water of hydration for each copper sulfate unit.
    • Upon heating, the blue crystals lost their water of hydration and turned into a white powder.
    • Calculating the percent mass of water of hydration is a common laboratory experiment.
Advanced Usage
  • "Driven off as water of hydration": A phrase describing the process of removing this water, usually by heating.
    • When gypsum is heated, water of hydration is driven off to form plaster of Paris.
  • The term is central to understanding and writing chemical formulas for hydrates, where it is denoted by a centered dot (·) followed by .
Variants and Related Words
  • Hydrate (n): A compound that contains water of hydration.
    • Copper(II) sulfate pentahydrate is a common hydrate.
  • Water of crystallization: A nearly synonymous term often used interchangeably with "water of hydration," emphasizing the water's role in forming the crystal lattice.
  • Anhydrous (adj): Describing a substance from which all water of hydration has been removed.
Synonyms
  • Crystal water
  • Water of crystallization (Note: This is a very close synonym, though subtle contextual preferences may exist.)
Related Phrases
  • Lose its water of hydration: To undergo dehydration.
    • The compound will lose its water of hydration if left in a dry atmosphere.
  • Bound water: A more general term that can include water of hydration but also other forms of chemically or physically trapped water.
water of hydration

A student observes the water of hydration leaving a blue crystal as it is heated.

Noun
  1. the water present in hydrated compounds

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