Synthesis of aluminium sulfate

Preparation of aluminium sulfate

Preparation of aluminium sulfate

Preparation of aluminium sulfate

30 g of potassium alum and 30 g of sodium carbonate are dissolved in 400 ml of boiling water. Both solutions are filtered, and with constant stirring hot potassium alum solution is poured into the hot solution of sodium carbonate. The reaction mixture is gently heated until the evolution of carbon dioxide ceases. The precipitated Al(OH)3 is washed with hot water until the washings no longer yield a precipitate with test solution of barium chloride. Then Al(OH)3 is decanted and dissolved by gentle heating in 9 g of conc. sulfuric acid, previously diluted with 50 ml of water. The solution of aluminium sulfate is filtered and evaporated. Pure aluminum sulfate is a white crystalline powder, odorless, taste sweetish, astringent. It is soluble in water, insoluble in alcohol.

Laboratory manual of inorganic and pharmaceutical preparations, by O. Miner, 12-13, 1911





InChI Key


Canonical SMILES


MeSH Synonyms

alum, aluminum hydrogen sulfate, aluminum potassium sulfate, aluminum sulfate, potassium aluminum sulfate

Depositor-Supplied Synonyms

ALUMINUM SULFATE, Aluminium sulfate, Dialuminum trisulfate, Filter Alum, Aluminum sulphate, Aluminium sulphate, Papermaker’s Alum, Aluminum sulfate (2:3), Sulfuric acid, aluminum salt (3:2), 10043-01-3, Aluminum alum, Pickle Alum, Pearl Alum, Dialuminum sulfate, Dialuminum sulphate, Sulfuric acid, aluminum salt, Cake alum (VAN), Aluminum sesquisulfate, Aluminum alum (VAN), Aluminum(III) silfate, Hi Soft C 2, Caswell No. 031A, Nalco 7530, Tai-Ace S 100, Tai-Ace S 150, Aluminum sulfate anhydrous, Aluminum sulfate (3:2), Sulphuric acid, aluminium salt, CCRIS 9170, UNII-I7T908772F, HSDB 5067, Aluminum sulfate (Al2(SO4)3), EINECS 233-135-0, EINECS 233-329-5, NSC 54563, EPA Pesticide Chemical Code 013906, Sulfatodialuminum disulfate (Al2(SO4)3), Sulfuric acid, aluminum(3+) salt (3:2), Alunogenite, Aluminiumsulfate, Stingose (TN), Sulfuric acid, aluminum salt (1:?), dialuminium trisulfate, aluminium sesquisulfate, aluminum(III) sulfate, aluminium(III) sulfate, aluminum salt (3:2), AC1L2NPX, aluminium sulfate (anh.), sulfatodialuminum disulfate, aluminium sulfate anhydrous, aluminium sulfate (2:3), sulfatodialuminium disulfate, aluminium sulfate (anhydrous), Al2(SO4)3, 202614_ALDRICH, 06421_FLUKA, CHEBI:74768, DIZPMCHEQGEION-UHFFFAOYSA-H, EINECS 259-881-7, Sulfuric acid, aluminum salt, basic, AKOS015903882, sulfuric acid, aluminium salt (3:2), I7T908772F, LS-3166, RL00038, 10043-67-1 (mono-potassium salt), 10124-29-5, LS-148173, RT-004828, FT-0622228, FT-0622229, V0798, D07565, I14-17609, I14-42853, I14-43352, 121739-79-5, 124027-27-6, 139939-73-4, 19239-71-5, 22337-62-8, 22515-37-3, 66578-72-1

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