Air raja: Perbedaan antara revisi

 

==Sejarah==

<!--

Aqua regia first appeared in the work of the European alchemist [[Pseudo-Geber]], dating from the early 14th century.<ref name="Principe 2012">{{cite book|last=Principe|first=Lawrence M.|title=The secrets of alchemy|year=2012|publisher=University of Chicago Press|location=Chicago|isbn=0226682951}}</ref> The third of [[Basil Valentine]]’s keys shows a dragon in the foreground and a fox eating a rooster in the background. The rooster symbolizes gold (from its association with sunrise and the sun’s association with gold), and the fox represents aqua regia. The repetitive dissolving, heating, and redissolving (the rooster eating the fox eating the rooster) leads to the buildup of chlorine gas in the flask. The gold then crystallizes in the form of [[gold(III) chloride]], whose red crystals were known as dragon’s blood. The reaction was not reported in modern chemical literature until 1890.<ref name="Principe 2012"/>