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Topic: Nitric Acid and Anhydrous Nitric Acid  (Read 4510 times)

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Offline gingi85

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Nitric Acid and Anhydrous Nitric Acid
« on: March 24, 2009, 05:18:55 AM »
What is the difference between nitric acid (HONO2) and anhydrous nitric acid?

When reacting nitric acid with sulfuric acid we get NO2+ + H2O and HSO4-. Is this anhydrous nitric acid? Shouldn't anhydrous acid be a liquid and not an ionic solution?
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Offline AWK

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Re: Nitric Acid and Anhydrous Nitric Acid
« Reply #1 on: March 24, 2009, 08:10:19 AM »
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Offline Vidya

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Re: Nitric Acid and Anhydrous Nitric Acid
« Reply #2 on: March 24, 2009, 10:28:52 AM »
Anhydrous nitric acid is 100% liquid  with no water.
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Offline gingi85

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Re: Nitric Acid and Anhydrous Nitric Acid
« Reply #3 on: March 24, 2009, 02:47:27 PM »
Thanks! So let me see if I understood correctly.

Regular concentrated nitric acid is 68% solution in water. This is because at that composition it creates an azeotrope.

In the lab, however, we can prepare 100% nitric acid by reacting with concentrated sulfuric acid and distilling. How does that work? What happened to the azeotrope?
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