Natural-gas (organic) -> hydrogen + nitrogen (air) -> ammonia + oxygen(air) -> nitric acid. L
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If you want to start with material that is both "organic", in the common sense of being "all natural", and organic in the chemistry sense of the word, meaning containing molecules with carbon-carbon bonds, then I think the way to go is by building yourself a good old-fashioned niter bed, as described here:http://en.wikipedia.org/wiki/Potassium_nitrate#History_of_production Supposing that niter bed works for you, and you successfully produce some KNO3, or similar nitrate salt, then the next step is this video from Nurdrage, appropriately titled "Make Nitric Acid - The Complete Guide"https://www.instructables.com/id/Make-Nitric-acid-The-Complete-Guide/ I wish you happy acid making! Please remember to wear your safety goggles, and use your acid responsibly.
nitric acid is not considered to be an organic compound.