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Stikstofdioksied

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Eienskappe

Algemeen

Naam Stikstofdioksied
Struktuurformule van
Nitrogen-dioxide-3D-vdW.png
Chemiese formule NO2
Molêre massa 46,01 g/mol
CAS-nommer 10102-44-0[1]  
Voorkoms Bruin gas; bruin vloeistof  
Reuk Stekend  
Reukdrempel 0,1 - 0,4 dpm[2]
Fasegedrag
Smeltpunt -11,2 °C
Kookpunt +21,2 °C
Digtheid 1,58 rel. lug
Oplosbaarheid Reageer met water; opl. in CCl4, CHCl3 
Henry se konstante 3,3 x 10-2 [L/mol.Atm]; 2000 [K] [3]

Suur-basis eienskappe

pKa

Veiligheid

Flitspunt  
LC50 115 dpm (rot: 1 uur)

Tensy anders vermeld is alle data vir standaardtemperatuur en -druk toestande.

 
Stikstofdioksied se vorme is afhanklik van temperatuur.
Stikstofdioksied se vorme is afhanklik van temperatuur.

Stikstofdioksied is 'n chemiese verbinding van stikstof en suurstof met die formule NO2.

Dit is 'n triatomiese molekulêre stof, wat 'n radikaal is en 'n geboë vorm het. Hierdie bruin gas maak 'n belangrike deel uit van lugbesoedeling en word in die atmosfeer maklik uit stikstofmonoksied gevorm.

Die stof kan dimeriseer en die kleurlose distikstoftetroksied vorm wat nie 'n radikaal is nie:

Hierdie dimerisasie is 'n ewewig wat na links skuif by laer temperatuur.

Reaktiwiteit

NO2 is 'n N(IV)-verbinding. In basiese waterige oplossings disproposioneer dit tot nitriet N(III) en nitraat N(V):

Met fluoor kan NO2 'n nitrielfluoried vorm:

Hierdie gas is 'n kragtige fluorineringsmiddel.[4]

Verwysings

  1. AirGas.
  2. "Emergency and Continuous Exposure Guidance Levels for Selected Submarine Contaminants. 2007" (in Engels). Geargiveer vanaf die oorspronklike op 13 Maart 2020.
  3. NIST.
  4. Inorganic Chemistry Mark Weller, Tina Overton, Jonathan Rourke, Fraser Armstrong OUP Oxford, 2014,ISBN 0-19-964182-X, ISBN 978-0-19-964182-6
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Stikstofdioksied
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