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Topic: detect N2 produced in reactions of metals and HNO3  (Read 5123 times)

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Offline tortoise

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detect N2 produced in reactions of metals and HNO3
« on: December 30, 2010, 09:23:19 AM »
Hi!

Somebody please tell me some methods to recognize it if N2 is produced in reactions of metals and HNO3.

Thank you in advance!
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Offline Wald_ron

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Re: detect N2 produced in reactions of metals and HNO3
« Reply #1 on: January 01, 2011, 06:11:42 PM »
N2 is a gas, so if you get a gas, then you may have N2
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Offline Borek

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Re: detect N2 produced in reactions of metals and HNO3
« Reply #2 on: January 01, 2011, 07:04:41 PM »
No. If there is a gas between products, it is most likely one of the nitrogen oxides.
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Offline rackye

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Re: detect N2 produced in reactions of metals and HNO3
« Reply #3 on: January 01, 2011, 07:16:43 PM »
true but some of the metals when reacts with HNO3 produces Hidrogen as a gas
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Offline Borek

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Re: detect N2 produced in reactions of metals and HNO3
« Reply #4 on: January 02, 2011, 06:19:13 AM »
This is tricky. You have highly reactive hydrogen (strong reducing agent) and nitric acid (strong oxidizing agent). They react immediately, so hydrogen doesn't survive long enough to leave the solution in substantial amounts.
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Offline jcjlf

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Re: detect N2 produced in reactions of metals and HNO3
« Reply #5 on: January 06, 2011, 02:36:23 PM »
Quote from: tortoise on December 30, 2010, 09:23:19 AM
Hi!

Somebody please tell me some methods to recognize it if N2 is produced in reactions of metals and HNO3.

Thank you in advance!

Some rough ideas, never tried:
Catch the evolving gases in a gas syringe, let enter  enough O2 to oxidize NO to NO2, dissolve the brown NO2 in distilled water, if there is N2 present it will remain for the most undissolved.
Or measure the density of the gaseous mixture with a gas syringe and compare it to table values?
Gas chromatography?

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