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Troll, banned on 11/1/2011. Registered Member #4171
Joined: Sat Oct 29 2011, 03:20PM
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Posts: 13
Nitric acid is pretty useful and pretty expensive when the haz mat fees are added. It's cheaper to make it at home. I've made nitric acid using 150ml of sulfuric acid. This is 0.831 mol of sulfuric acid, and 1 mol of sulfuric acid with 2 mols of potassium nitrate to make 2 mols of nitric acid. So we need 1.661 mol of potassium nitrate which is approximately 168 grams. What you do is add the sulfuric acid into a retort or distil flask and add the potassium nitrate with stirring. Then simple distillation is needed to seperate out the nitric acid. It works just as well with a retort as a distillation setup. The theoretical yeild is approx. 84ml of nitric acid, which is about what I've gotten. This is enough for most experiments, especially when you dilute it to the common 70%, giving about 120ml. The reactants can always be increased however. Also, when distilling, a lot of nitrogen dioxide is produced in the beginning from nitric acid decomposing. This goes away soon, leaving almost no NO2, just nitric acid vapors. It bubbles quite a bit, so care should be taken if doing this in a retort.
If anyone tries this, let me know how it worked for you.
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Making Nitric Acid
