3) a) What is aqua regia
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Aqua regia is a substance which can melt Gold, platinum, iron, silver
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Aqua regia is a mixture of nitric acid and hydrochloric acid, optimally in a molar ratio of 1:3. Aqua regia is a yellow-orange fuming liquid, so named by alchemists because it can dissolve the noble metals gold and platinum, though not all metals.
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