hydrate

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hydrate

(hī`drāt), chemical compound that contains water. A common hydrate is the familiar blue vitriol, a crystalline form of cupric sulfatecupric sulfate
or copper (II) sulfate,
chemical compound, CuSO4, taking the form of white rhombohedral crystals or amorphous powder. It decomposes at 650°C; to cupric oxide (CuO).
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. Chemically, it is cupric sulfate pentahydrate, CuSO4·5H2O. When a crystal of the substance is formed, five molecules of water (H2O) are combined in the crystal with each molecule of cupric sulfate (CuSO4). This water is called water of crystallization. When cupric sulfate pentahydrate is heated above 150°C; the water of crystallization is driven off and anhydrous cupric sulfate is formed. It has several properties different from the pentahydrate, e.g., color, density, and crystal structure. Glauber's saltGlauber's salt,
common name for sodium sulfate decahydrate, Na2SO4·10H2O; it occurs as white or colorless monoclinic crystals. Upon exposure to fairly dry air it effloresces, forming powdery anhydrous sodium sulfate.
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 is sodium sulfate decahydrate, Na2SO4·10H2O. Crystals of it readily give up their water of crystallization at ordinary temperatures, forming a powdery coating of the anhydrous salt; this phenomenon (efflorescence) is exhibited by many hydrates. The number of molecules of water present in a given hydrate is fixed. However, some substances form several different hydrates. There are four different hydrates of ferrous sulfate, each with its own unique physical properties. In organic chemistry a compound formed by addition of water to a carbon-carbon double bond is sometimes called a hydrate; it contains a hydroxyl functional group and usually cannot be dehydrated. In commerce a metal hydroxide is sometimes called a hydrate; e.g., calcium hydrate is calcium hydroxide.

hydrate

[′hī‚drāt]
(chemistry)
A form of a solid compound which has water in the form of H2 O molecules associated with it; for example, anhydrous copper sulfate is a white solid with the formula CuSO4, but when crystallized from water a blue crystalline solid with formula CuSO4·5H2 O results, and the water molecules are an integral part of the crystal.
A crystalline compound resulting from the combination of water and a gas; frequently a constituent of natural gas that is under pressure.

hydrate

1. To combine with water or elements of water.
2. Hydrated lime.

hydrate

1. a chemical compound containing water that is chemically combined with a substance and can usually be expelled without changing the constitution of the substance
2. a chemical compound that can dissociate reversibly into water and another compound. For example sulphuric acid (H2SO4) dissociates into sulphur trioxide (SO3) and water (H2O)
3. a chemical compound, such as a carbohydrate, that contains hydrogen and oxygen atoms in the ratio two to one
References in periodicals archive ?
Clathrate hydrates (or gas hydrates) are crystalline water-based solids physically resembling ice, in which small non-polar molecules (typically gases) or polar molecules with large hydrophobic moieties are trapped inside 'cages' of hydrogen bonded water molecules.
Compared with the PETM, the amount of gas being released by hydrates off the U.
If successful, the experiment will be the first stable production of methane hydrates from the seafloor, the officials said.
The state-owned Japan Oil, Gas and Metals National Corp (JOGMEC) has invited proposals from potential candidates for the first offshore production test of hydrates in the Eastern Nankai Trough, off central Japan in the Pacific Ocean.
But commercial exploitation of the permafrost methane hydrates is very likely to happen within that time.
Publication rates in peer-reviewed journals have displayed nearly exponential growth in the century following the discovery of hydrates in the laboratory, with more than 3000 refereed publications as of the 1990s [3].
2] into a reservoir that has the right conditions and it contacts the reservoir water and forms hydrates, it's in a pretty stable form," said Grozic.
Merck Patent GmbH has obtained a patent for a stabilized BiOCl pigment, which is comprised of a base BiOCl pigment which has a coating comprised of one or more polymers and a coating comprised of one or more oxides, oxide hydrates or hydroxides of silicon, wherein the coating comprised of one or more polymers and the coating comprised of one or more oxides, oxide hydrates or hydroxides of silicon are provided as separate coatings and, wherein the coating comprised of one or more oxides, oxide hydrates or hydroxides of silicon is provided on top of the coating comprised of one or more polymers.
If we develop gas hydrates near Dokdo, we will keep our territorial sovereignty, and will benefit by securing energy reserves that we lack," local media quoted Lee Youn-ho, the Korean energy minister, as saying during a parliamentary session.
De nombreux pays aux reserves limitees de combustibles fossiles cherchent comment exploiter les hydrates de gaz naturel--cette << glace de methane >> qu'on trouve la ou existe le perge1isol ainsi que sur le plancher oceanique.
Scientists are beginning to speculate that the Earth may have enough methane (the major component of natural gas) stored in hydrates to provide power to our energy-hungry civilization for literally hundreds of years.
Global reserves of methane hydrates are estimated at 100 times greater than conventional natural gas resources.