|OTP appearance||colorless gas|
|Solubility in water(g/L)||0.02|
|Speed of sound
20°C, 1atm (m/s)
Under normal circumstances Nitrogen is a fairly inert gas (N2). It is the primary constituent of air.
Ecological nitrogen cycle
Gaseous nitrogen (N2) is cleaved by nitrogenase (usually found in single-celled organisms called Diazotrophs) and integrated into the organism's metabolism, usually reentering the ecosystem as ammonia when the organism dies or excretes. Ammonia is absorbed by water and becomes ammonium ions. Ammonium ions are consumed by Nitrosomonas (and others) which convert ammonium ions to nitrite ligands, which are oxidized to nitrates by Nitrobacter (and others). These nitrates can be chemically isolated when bonded to alkali metals.
|Actor||Source Nitroform||Chemistry||Resultant Nitroform||Timeframe|
|Nitrogenase in the Diazotroph||Atmospheric N2||2 N2 + 6 H2O → 4 NH3 + 3 O2||Ammonia||Continuously|
|Urease in bacteria and fungi||Urea||(NH2)2CO + H2O → CO2 + 2 NH3||Ammonia||"a few days"|
|Water||Ammonia||NH3 + H2O → NH4- + OH +||Ammonium ions||Immediately|
|Nitrosomonas||Ammonium ions||NH4- + 2 O2 → NO2- + 2 H2O||Nitrites||"a few weeks"|
|Nitrobacter||Nitrites||2 NO2- + O2 → NO3-||Nitrates|
- As an inert gas
- As a source of ammonia via the haber process
- As gaseuous N2 in air
- As a component of urea (CO(NH2)2) in animal waste
- As a component of ammonia (NH3) in decomposed organic waste
- Nitrogen asphyxia
- from air. See air for separation of nitrogen from air.
- Combine (as dried solids) sodium nitrate and charcoal
- Heat until molten and charcoal ignites
- 4 NaNO3 + 5 C → 2 Na2CO3 + 3 CO2 + 2 N2
- Lead resultant gases through a solution of sodium hydroxide or calcium hydroxide
- N2(g) + CO2(g) + 2 NaOH(aq) → Na2CO3(aq) + H2O + N2(g)
- Recover the nitrogen gas emerging from the solution.
- NH4Cl + NaNO2 → NH4NO2 + NaCl
- NH4NO2 → N2(g) + 2 H2O(l)