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Is Aluminum Hydroxide Soluble In Water?

Dec. 22, 2021

Aluminum hydroxide (Al(OH) 3) exists in nature as the mineral gibbsite (also known as hydrargillite) and its three rarer polymorphs: bayerite, stilbite and Norders Trang stone. Aluminum hydroxide is amphoteric, that is, it has both basic and acidic properties. Closely related are alumina hydroxide, AlO(OH) and alumina or alumina (Al2O3), the latter is also amphoteric. These compounds together constitute the main components of aluminum ore and bauxite.

Is Aluminum Hydroxide Soluble In Water?

Aluminum hydroxide is amphoteric-it reacts with acids and bases. Like any regular base, the OH radicals in Al(OH)3 neutralize H+ to produce water and aluminum salts. Al(OH)3 solid will also react with excess OH- to dissolve and form complex ion [Al(OH)4]-.

Is Aluminum Hydroxide Soluble In Water

Under any ordinary conditions, Al(OH)₃ are solid. Above 300 °C it is liquid. It will decompose somewhere above this temperature, so it has no boiling point, so it cannot be a gas.

How does aluminum hydroxide dissolve?

Dissolve 0.10 g in 5 mL hydrochloric acid (~70 g/l) TS, boil, cool, dilute to 10 mL with water and filter.

What is the Molar mass of Aluminum Hydroxide?

Aluminum Hydroxide Wholesale tell you Molar mass of Aluminum Hydroxide 78 g/mol

Uses of aluminum hydroxide

Flame retardant filler

Aluminum hydroxide can also be used as a flame retardant filler for polymer applications. It was chosen for these applications because it is colorless (like most polymers), inexpensive, and has good flame retardant properties.

Precursors of aluminum compounds

Aluminum hydroxide is the raw material for the manufacture of other aluminum compounds: special calcined alumina, aluminum sulfate, polyaluminum chloride, aluminum chloride, zeolite, sodium aluminate, activated alumina and aluminum nitrate.

The newly precipitated aluminum hydroxide forms a gel, which is the basis for the aluminum salt to be used as a flocculant in water purification. This gel will crystallize over time.


Under the common name "algeldrate", aluminum hydroxide is used as an antacid for humans and animals (mainly cats and dogs). It is superior to other alternatives, such as sodium bicarbonate, because the insoluble Al(OH)3 will not increase the pH of the stomach above 7, so it will not trigger the stomach to secrete excessive acid. Brand names include Alu-Cap, Aludrox, Gaviscon or Pepsamar. It reacts with excess acid in the stomach and reduces the acidity of stomach contents, which can relieve symptoms of ulcers, heartburn or indigestion. Such products can cause constipation because aluminum ions inhibit the contraction of smooth muscle cells in the gastrointestinal tract, slow down peristalsis, and extend the time it takes for stool to pass through the colon. Some of these products are formulated to minimize these effects by including equal concentrations of magnesium hydroxide or magnesium carbonate, which have a balanced laxative effect. Contact us.


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