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Ammoniumsulfied

Eienskappe

Algemeen

Naam Ammoniumsulfied 
Ander name Stinkbom
Struktuurformule van
Struktuurformule van
Chemiese formule (NH4)2S
Molêre massa 68,14 [g/mol][1]
CAS-nommer 12135-76-1[1]  
Voorkoms Kleurlose (geel) vastestof  
Reuk Stink soos ammoniak en vrot eiers[1]
Fasegedrag  
Ruimtegroep Fm3m[2]  
Strukturbericht C1
Smeltpunt ontbind [1]
Kookpunt ontbind[1]
Digtheid
Oplosbaarheid

Suur-basis eienskappe

pKa

Veiligheid

Flitspunt 22 °C[1]

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

 
Portaal Chemie

Ammoniumsulfied (NH4)2S is 'n sout van ammoniak en waterstofsulfied.

Die verbinding kan as kleurlose kristalle verkry word deur by lae temperature (-18°C) droë ammoniakgas en droë waterstofsulfiedgas te meng. Hierdie kristalle en hulle oplossings in water word vinnig geel deur oksidasie van die sulfiedioon tot die disulfiedioon:[3]

Hoër sulfiede soos (NH4)S3 kan by verdere oksidasie of toevoeging van swawel ook gevorm word. 'n Ammoniumsulfiedoplossing kan swawel in oplossing doen gaan maar ook sulfiede soos tin(IV)sulfied:[4]

By kamertemperatuur is die vastestof in ewewig met die gasvormige suur en basis waarvan dit 'n sout is:

Die vastestof ontbind reeds by kamertemperatuur. Sy dampdruk by 20°C is reeds 600hPa (~0,6 Atm)[5]

Die stof is goed oplosbaar in water, maar die ioon S2− is 'n baie sterkbasis en ondergaan hidrolise:

Die oplossing bevat dus die ione 2NH+4, OH en HS.

Die suiwere vastestof is baie brandbaar en onstabiel en die stof word gewoonlik as oplossing in water verkoop. Die oplossing is sterk basies (pH=9,5 in 45% oplossing). Die verbinding kan met 'n ontploffing reageer met oksiderende stowwe soos perchloraat, peroksied, permanganaat, chloraat, nitraat, chloor, broom en fluoor. Dit reageer met sterk sure en stel daarby toksiese waterstofsulfiedgas vry. Dit reageer met sterk basisse en stel ammoniak vry. Dit korrodeer koper, sink en hulle legerings.

Struktuur

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Op planete soos Uranus en Neptunus kom dit saam met ammoniumwaterstofsulfied NH4HS in wolke in die laer dampkring voor. Berekenings voorspel dat (NH4)2S 'n anti-fluorietstruktuur sal hê met ruimtegroep Fm3m met ammoniumione op die fluoorione se plek, en sulfiedione op kalsiumione s'n.[2]

Verwysings

[wysig | wysig bron]
  1. 1,0 1,1 1,2 1,3 1,4 1,5 "Hazardous Substance Fact Sheet" (PDF). New Jersey gov. Besoek op 19 Julie 2023.
  2. 2,0 2,1 Xiaofeng Li, Angus Lowe, Lewis Conway, Maosheng Miao, Andreas Hermann. "Dense metallic hydrogen sulfide-ammonia ices".((cite web)): AS1-onderhoud: gebruik authors-parameter (link)
  3. Roscoe;J.D.van der Plaats (1903). Roscoe's beknopt leerboek der scheikunde.((cite book)): AS1-onderhoud: gebruik authors-parameter (link)
  4. J.E. Enklaar (1907). Greondbeginselen der chemie.((cite book)): AS1-onderhoud: gebruik authors-parameter (link)
  5. "Ammoniumsulfid, wässrige Lösung". GESTIS-Stoffdatenbank. Besoek op 19 Julie 2023.
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Ammoniumsulfied
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