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Aluminium sulfate is rarely, if ever, encountered as the anhydrous salt. It forms a number of different hydrates, of which the hexadecahydrate Al 2 (SO 4) 3 ·16H 2 O and octadecahydrate Al 2 (SO 4) 3 ·18H 2 O are the most common. The heptadecahydrate, whose formula can be written as [Al(H 2 O) 6] 2 (SO 4) 3 ·5H 2 O, occurs naturally as the ...
The only stable chalcogenides under normal conditions are aluminium sulfide (Al 2 S 3), selenide (Al 2 Se 3), and telluride (Al 2 Te 3). All three are prepared by direct reaction of their elements at about 1,000 °C (1,832 °F) and quickly hydrolyse completely in water to yield aluminium hydroxide and the respective hydrogen chalcogenide .
2 O and Al 2 (SO 4) 3 ·17 H 2 O. [3] [4] The Ancient Greek Herodotus mentions Egyptian alum as a valuable commodity in The Histories. [5] The production of potassium alum from alunite is archaeologically attested on the island Lesbos. [6] The site was abandoned during the 7th century CE, but dates back at least to the 2nd century CE.
2 Al + 3 S → Al 2 S 3. This reaction is extremely exothermic and it is not necessary or desirable to heat the whole mass of the sulfur-aluminium mixture; (except possibly for very small amounts of reactants). The product will be created in a fused form; it reaches a temperature greater than 1,100 °C and may melt its way through steel.
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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.
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Maguire was cast as Spider-Man in the Sam Raimi trilogy in 2000 and proceeded to star in 2002's Spider-Man, 2004's Spider-Man 2 and 2007's Spider-Man 3.Dunst starred as Mary Jane, Peter Parker's ...