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Nitric acid (HNO3), also known as aqua fortis (Latin for "strong water") and spirit of niter, is a highly corrosive mineral acid.

Aqua regia (; from Latin, lit. "royal water" or "king's water") 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.

Applications

Aqua regia is primarily used to produce chloroauric acid, the electrolyte in the Wohlwill process for refining the highest quality (99.999%) gold.

Sodium fluoride (NaF) is a chemical compound and medication. As a medication it is primarily used to prevent tooth decay in children older than 6 months in areas where the drinking water is low in fluoride. Sodium fluoride is used as a liquid, pill, or paste by mouth with this use being known as fluoride therapy.
Chemistry