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Aluminium hydroxide Al(OH)3 Reactions

作者:ihpa.net 发布时间:2017-11-05

Al(OH)3 - ALUMINIUM HYDROXIDE

Properties of aluminium hydroxide:

Gibbsite (monoclinic), bayerite (trigonal). White, thermally unstable. Not soluble in water. It does not react with ammonium hydroxide, ammonium chloride, sulfur dioxide and hydrogen sulfide. Shows amphoteric properties; reacts with acids and alkalis in solution and during sintering.


Molar mass   g/mol   78  
Density   g/cm3   2.42  

Methods for preparation of aluminium hydroxide:

KAl(SO4)2 + 3KOH(diluted, cold) = Al(OH)3↓ + 2K2SO4,

2KAl(SO4)2 + 6(MH3 H2O)[conc., cold] = 2Al(OH)3↓ + K2SO4 + 3(NH4)2SO4,

2KAl(SO4)2 + 6(NH3 H2O)[conc., hot] = 2AlO(OH)↓ + K2SO4 + 3(NH4)2SO4 + 2H2O.

AlCl3 + 3(NH3 H2O)[conc., cold] = Al(OH)3↓ + 3NH4Cl,

AlCl3 + 3(NH3 H2O)[conc., hot] = AlO(OH)↓ + 3NH4Cl + H2O.

Na[Al(OH)4] = time = Al(OH)3↓ + NaOH (dilution with water).

Na[Al(OH)4] + CO2 = Al(OH)3↓ + NaHCO3.

3Na[Al(OH)4] + AlCl3(conc.) = 4Al(OH)3↓ + 3NaCl.


Chemical reactions with aluminium hydroxide:

Al(OH)3 = AlO(OH) + H2O (to 200° C),

2Al(OH)3 = Al2O3 + 3H2O (above 575° C).

Al(OH)3(solid) + 6H2O = [Al(H2O)6](3+) + 3OH(-),

Al(OH)3(solid) + 4H2O = [Al(H2O)2(OH)4](-) + H3O(+).

Al(OH)3 + 3HCl(diluted) = AlCl3 + 3H2O.

Al(OH)3 + NaOH(conc.) = Na[Al(OH)4],

Al(OH)3 + NaOH = NaAlO2 + 2H2O (1000° C).

Al(OH)3 + 3HF(conc.) + 3NaF = Na3[AlF6]↓ + 3H2O.

boron doped Silicon powderSilver powderTin Sulfide powderTin Sulfide powderSilicon powder

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