water of crystallization

American  

noun

Chemistry.

1. water of hydration, formerly thought necessary to crystallization: now usually regarded as affecting crystallization only as it forms new molecular combinations.

---

water of crystallization British  

noun

1. water present in the crystals of certain compounds. It is chemically combined in stoichiometric amounts, usually by coordinate or hydrogen bonds, but can often be easily expelled

---

water of crystallization Scientific  

1. Water in a crystal structure that is chemically combined with the other elements in the crystal. The water of crystallization is necessary for the maintenance of crystalline properties, but it can be removed by heat.

---

Etymology

Origin of water of crystallization

First recorded in 1785–95

Example Sentences

A crystallizable compound of a salt with alcohol, in which the latter plays a part analogous to that of water of crystallization.

From Project Gutenberg

Somewhat analogous to double salts are the molecular compounds formed by the introduction of “water of crystallization,” “alcohol of crystallization,” &c.

From Project Gutenberg

At ordinary temperatures it crystallizes from aqueous solutions in large colourless monoclinic prisms, which effloresce in dry air, and at 35�C. melt in their water of crystallization.

From Project Gutenberg

In 1835 he published the results of an examination of the properties of water of crystallization as a constituent of salts.

From Project Gutenberg

Sodium thiosulphate is a comparatively stable cheap salt, containing 5 molecules of water of crystallization, Na2S2O3·5H2O but 7 parts are necessary to remove 1 part by weight of chlorine.

From Project Gutenberg