Which acid can dissolve gold and which will make gold

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Solution

"royal water" or "king's water") is a mixture of nitric acid and hydrochloric acid, optimally in a molar ratio of 1:3. Aqua regiais a yellow-orange fuming liquid, so named by alchemists because it can dissolve the noble metals gold and platinum, though not all metals.

Chloroauric acid is used to make gold.

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