WATER OF HYDRATION Definition & Meaning

water of hydration

Chemistry.

the portion of a hydrate that is represented as, or can be expelled as, water: now usually regarded as being in true molecular combination with the other atoms of the compound, and not existing in the compound as water.

water of hydration

Water that is chemically combined with other molecules to form a hydrate mineral and that is easily removed through heating.

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First recorded in 1885–90

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Examples have not been reviewed.

In enamelling it cannot be used; the colour, depending on the water of hydration, being destroyed by a strong heat.

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Conversely, if only 3/4 of the water of hydration be expelled during the baking of gypsum, the material obtained should hydrate itself more slowly.

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The hydrate of baryta melts by a low red heat without losing its water of hydration.

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