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Crystal of potassium alum, KAl(SO 4) 2 ·12H 2 O. An alum (/ ˈ æ l ə m /) is a type of chemical compound, usually a hydrated double sulfate salt of aluminium with the general formula X Al(SO 4) 2 ·12 H 2 O, such that X is a monovalent cation such as potassium or ammonium. [1] By itself, "alum" often refers to potassium alum, with the ...
Aluminium powder is powdered aluminium. This was originally produced by mechanical means using a stamp mill to create flakes. Subsequently, a process of spraying molten aluminium to create a powder of droplets was developed by E. J. Hall in the 1920s.
In 1758, French chemist Pierre Macquer wrote that alumina [d] resembled a metallic earth. [13] In 1760, French chemist Théodore Baron d'Hénouville expressed his confidence that alumina was a metallic earth. [13] In 1767, Swedish chemist Torbern Bergman synthesized alum by boiling alunite in sulfuric acid
The nature of alum remained unknown. Around 1530, Swiss physician Paracelsus suggested alum was a salt of an earth of alum. [79] In 1595, German doctor and chemist Andreas Libavius experimentally confirmed this. [80] In 1722, German chemist Friedrich Hoffmann announced his belief that the base of alum was a distinct earth. [81]
Chemist Warehouse Group (trading as Chemist Warehouse, My Chemist, My Beauty Spot) [3] is an Australian company operating a chain of retail pharmacies both locally and internationally. The company is one of Australia's largest pharmacy retailers with over 500 stores in Australia, [ 4 ] and employs over 20,000 staff. [ 5 ]
Potassium alum, potash alum, or potassium aluminium sulfate is a chemical compound first mentioned under various Sanskrit names in Ayurvedic medicinal texts such as charak samhita, sushrut samhita, and ashtang hridaya; is chemically defined as the double sulfate of potassium and aluminium, with chemical formula KAl(SO 4) 2.
Ammonium aluminium sulfate, also known as ammonium alum or just alum (though there are many different substances also called "alum"), is a white crystalline double sulfate usually encountered as the dodecahydrate, formula (NH 4)Al(SO 4) 2 ·12H 2 O. It is used in small amounts in a variety of niche applications.
The history of alum production in Britain is quite interesting. Alum was vital to the economically important wool and textiles trade. Britain used to import alum from mines on the continent, but this supply could be cut off by political disputes (e.g. as a result of Henry VIII's dispute with the Catholic church).