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Aqua Regia

jerryshizzle123
in Inorganic Chemistry

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I have a sample of dental gold that I would like to refine using aqua regia. My nitric acid is ~95%, but my hydrochloric acid is of only 20% concentration; is this strong enough to make effective aqua regia, or should I buy some 32% HCl?

I have a sample of dental gold that I would like to refine using aqua regia. My nitric acid is ~95%, but my hydrochloric acid is of only 20% concentration; is this strong enough to make effective aqua regia, or should I buy some 32% HCl?

 

I've made aqua regia before with less than concentrated acid for cleaning NMR tubes. It worked pretty well but there was a noticeable difference. We were out of concentrated HCl in the lab. You can calculate it to where the molar ratio of nitric to hydrochloric is still 1:3 like it is supposed to be ideally, it just won't be as concentrated.

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