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how do you concentrate or distill 68 percent nitric acid to make it 90 percent or more? Answered

 

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lemonie (author)2010-05-13
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Jayefuu (author)lemonie2010-05-13

"A commercial grade of fuming nitric acid, referred to in the trade as "strong nitric acid" contains 90% HNO3 and has a density of 1.50 g/mL. This grade is much used in the explosives industry. It is not as volatile nor as corrosive as the anhydrous acid and has the approximate concentration of 21.4 molar."

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lemonie (author)Jayefuu2010-05-13

It's sometimes used as an oxidiser in rocket/missile fuel, coupled with hydrazine hydrate for example.

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