Aluminum hydroxide A1

Many consumers view the color of lipstick as the most important characteristic of this product. The colors and dyes of lipsticks are generally regulated within the United States and include many water-insoluble (oil-soluble) products, such as brilliant blue, erythrosine, amaranth, rhodamine, tartrazine, dibromofluorescein, and tetrabromofluorescein (bluish-red com-pound). The dyes must be water insoluble otherwise, the color would quickly fade or be removed in a short time by the consumer through the movement of the saliva-soaked tongue across the lips. Water-soluble dyes such as green or blue food dyes may be used to provide lipstick coloration, but they are usually first laked or combined with metal oxides such as aluminum hydroxide [A1(OH3)] to form an insoluble precipitate that is then suspended in the oil base of the lipstick. 

Three methods are available for the preparation of aluminum fluoride commercially. In the first method, alumina trihydrate (aluminum hydroxide A1(0H)3) is treated with hydrofluoric acid (HF). A second method of preparation is almost identical except that it takes place in the dry state... 

The aluminum hydroxide (A1(0H3)) that is produced in this reaction is then heated to drive off water, producing aluminum oxide. Wastes from coal mining operation are also treated to extract the aluminum sulfate (A12(S04)3) they contain. The aluminum sulfate is converted to aluminum hydroxide which, again, is heated to produce aluminum oxide. 

When this salt is reacted with sulfuric acid, H2SO4, aluminum hydroxide, A1(H2O)3(OH)3, precipitates... 

In 1948, Montedison and Lurgi piloted a fluidized bed for synthesis of AIF3 from aluminum hydroxide A1(0H)3 and hydrofluoric acid by the reaction... 

Bases also constitute the active ingredient in antacids. There are hundreds of different brands of antacids, most of which contain one or more of the following bases sodium bicarbonate (NaHCOj), calcium carbonate (CaCOj), magnesium carbonate (MgC03), magnesium hydroxide (MglOHlj), and aluminum hydroxide (A1(0H)3). These antacids dissociate in water to produce a metal ion and a base. Sodium bicarbonate, for example, produces sodium ions and basic bicarbonate ions (HCOj ) in solution ... 

Potassium nitrate-aluminum compositions must be kept quite dry in storage to avoid decomposition problems, but mixtures of aluminum and nonhygroscopic barium nitrate can be stored with a minimum of precautions, as long as the composition does not actually get wet. Mixtures of magnesium metal with nitrate salts do not have this alkaline-catalyzed decomposition problem. A magnesium hydroxide, Mg(OH)2, coating on the metal surface apparently protects it from further reaction. This protection is not provided to aluminum metal by the alkaline-soluble aluminum hydroxide, A1(0H)3. 

Addition of lithium aluminum hydride to an aldehyde or ketone furnishes initially an alkoxyaluminum hydride, which continues to deliver hydride to three more carbonyl groups, in this way reducing a total of four equivalents of aldehyde or ketone. Work-up with water consumes excess reagent, hydrolyzes the tetraalkoxyaluminate to aluminum hydroxide, A1(0H)3, and releases the product alcohol. 

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