Hydroxides


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Hydroxides

 

chemical compounds formed from oxides of elements and water; one of the main classes of inorganic compounds. Hydroxides are often called oxide hydrates, a name that does not correspond to the nature of hydroxides, since they do not contain separate water molecules. “Hydroxides” is the term that has been adopted in modern international nomenclature.

Hydroxides of almost all chemical elements are known. The hydroxides of many metals are bases, and the hydroxides of nonmetals are oxygen acids. The chemical properties of the bases are determined by the presence of the hydroxyl ion, OH"; those of the acids are determined by the hydrogen ion, H+. This is in accord with the particular way in which the formulas for acids and bases are written—for example, Ba(OH)2 and H2SO4. Hydroxides that have both basic and acidic properties are called amphoteric. The nature of a hydroxide depends on the position of the element in the Mendeleev periodic system. In practice the term “hydroxide” is used only for bases and amphoteric hydroxides.

References in periodicals archive ?
Metal hydroxides are among the most commonly used flame retardants worldwide.
In the present study, layered double hydroxide (LDH) nanoparticles were used as the solid phase in the SPE method," he added.
Martinal aluminum hydroxide flame retardants for polymers with processing temperatures to 392 F; and Magnifin magnesium hydroxide flame retardants for thermoplastics and elastomers requiring higher process temperatures up to 644 F.
In separate container, dissolve sodium hydroxide in equal parts of water and add to batch.
However, the researchers have not yet been able to identify the specific carbon-containing compounds mixed in with the solid hydroxide product.
European consumers of hydroxide and peroxide of Magnesium; Oxides, hydroxides and peroxides of strontium or barium are briefly overviewed as well.
Quaternary ammonium salts and hydroxides exports segmented by region and country (2008)
The activity of both oxides and hydroxides is related to surface area.
RESUME: THE WORLD TRADE IN QUATERNARY AMMONIUM SALTS AND HYDROXIDES (2000-2006)
Nickel and cobalt were recovered as either a combined "mixed hydroxide precipitate" or as separate purified nickel and cobalt hydroxide precipitate products for off-take/refinery treatment.
Standard and surface-modified alumina tri-hydrate and Zerogen magnesium hydroxide flame retardants.