Question

Name a mixture of two highly concentrated acids in which reactive metals like gold can easily melt
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Answer 1

Answer:

Aqua regia (/ˈreɪɡiə, ˈriːdʒiə/; from Latin, lit. "regal water" or "king's water") is a mixture of nitric acid and hydrochloric acid, optimally in a molar ratio of 1:3.[note 2] Aqua regia is a yellow-orange (sometimes red) fuming liquid, so named by alchemists because it can dissolve the noble metals, gold and platinum, though not all metals.

Answer 2

Answer:

The University of Nottingham published a video showing gold dissolve into aqua regia (a mixture of nitric acid and hydrochloric acid). Aqua Regia is a mixture of two acids, hydrochloric acid and nitric acid. Now the exciting thing about Aqua Regia is that neither of the two acids by themselves can dissolve gold.