Alchemical And Later Discoveries And Uses Of Alum Mineral

Alchemical And Later Discoveries And Uses Of Alum Mineral



Discovered and​ alchemical and​ posterior uses the presence of​ potassium the sulphuric alum acid was known to​ the alchemists. J.H. Pott and​ A.S. Marggraf showed that alumina was another constituent. Pott in​ its Lithogeognosia proved that the precipitate obtained when an​ alkali is​ versed in​ an​ alum solution​ is​ completely different from lime and​ chalk, with which it​ had been confused by G.E. Stahl. Marggraf proved that alumina is​ one of​ the components of​ alum, but that this​ ground has the particular properties, and​ is​ one of​ the clay commun run ingredients.

It also proved that crystals of​ alum cannot be obtained by dissolving alumina in​ sulphuric acid and​ evaporating the solutions, but when an​ ammonia or​ potash solution​ is​ released in​ this​ liquid, it​ immediately deposits the perfect crystals of​ alum. Torbern Bergman also observed that the addition​ of​ potash or​ made ammonia the solution​ of​ alumina in​ sulphuric acid crystallizes, but that the same effect was not produced by the addition​ of​ soda or​ lime, and​ that potassium sulphate is​ frequently found out of​ alum.

Short-term uses in​ industry the alum was imported in​ England​ mainly of​ the Middle East, and, as​ from late the 15th century, the papal states for​ hundreds of​ years. Its use there was as​ a​ dye-fixer (corrosive) for​ the wool (which was one of​ primary industries of​ England), the value of​ which appreciably increased if​ dyed. These sources were dubious, however, and​ there was a​ push to​ develop a​ source in​ England. With the financing of​ state, attempts were made throughout the 16th century, but without success until as​ of​ the access inside at​ the 17th century. an​ industry was founded in​ Yorkshire to​ treat the schist which contained the principal ingredient, sulphates aluminium, and​ contributed an​ important share to​ the industrial revolution. The alum (known under the name of​ turti in​ local Indian languages) was also employed for​ the treatment water by Indians for​ hundreds of​ years.

After M.H. Klaproth discovered the presence of​ potassium in​ leucite and​ lepidolite, it​ occurred with L.N. Vauquelin​ that it​ was probably an​ of​ the same ingredient in​ much of​ other ores. Knowing that the alum cannot be obtained out of​ crystals without addition​ of​ potash, it​ started with suspecter that this​ alkali constituted an​ essential ingredient in​ salt, and​ in​ 1797 it​ published an​ essay showing that the alum is​ a​ double salt, composed of​ sulphuric acid, alumina, and​ potash.

A little later J.A. Chaptal published the analysis of​ four kinds different of​ alum, namely, Roman alum, alum of​ Raising, British alum and​ alum built all alone. this​ analysis led to​ the same result as​ Vauquelin.




You Might Also Like:




No comments:

Powered by Blogger.