59, Praseodym (Pr)

gr. prasinos = grün, didymos = Zwilling, grüner Zwilling

Massenwirkungsgesetz

         
   
  Ce Pr Nd  
  Th Pa U  
         
 

Löslichkeitsprodukte:

Substanz Formel Reaktion pL β (g/L)

Praseodym(III)arsenat PrAsO4 PrAsO4 ↔ Pr3+ + AsO43- 22 2.8•10-9
Praseodym(III)carbonat Pr2(CO3)3 Pr2(CO3)3 ↔ 2Pr3+ + 3CO32- 34.8 1.99•10-5
Praseodym(III)fluorid PrF3 PrF3 ↔ Pr3+ + 3F- 18.7 1.83•10-3
Praseodym(III)hydroxid Pr(OH)3 Pr(OH)3 ↔ Pr3+ + 3OH- 22.4 2.11•10-4
Praseodym(III)iodat Pr(IO3)3 Pr(IO3)3 ↔ Pr3+ + 3IO3- 10.97 5.27•10-1
Praseodym(III)molybdat Pr2(MoO4)3 Pr2(MoO4)3 ↔ 2Pr3+ + 3MoO42- 21.49 1.5•10-2
Praseodym(III)phosphat PrPO4 PrPO4 ↔ Pr3+ + PO43- 24.7 1.05•10-10
Praseodym(III)sulfat Pr2(SO4)3 Pr2(SO4)3 ↔ 2Pr3+ + 3SO42- 1.24 1.26•102

Komplexdissoziationskonstanten:

Komplex Formel Reaktion pD

Dicarbonatopraseodymat(III) Pr(CO3)2- Pr(CO3)2- ↔ Pr3+ + 2CO32- 12.63
Diphosphatopraseodymat(III) Pr(PO4)23- Pr(PO4)23- ↔ Pr3+ + 2PO43- 19.08
Disulfatopraseodymat(III) Pr(SO4)2- Pr(SO4)2- ↔ Pr3+ + 2CO32- 4.9
Praseodym(III)-EDTA-Komplex Pr(EDTA)- Pr(EDTA)- ↔ Pr3+ + EDTA4- 16.36
Tetrachloridopraseodymat(III) PrCl4- PrCl4- ↔ Pr3+ + 4Cl- -0.75
Tetrafluoridopraseodymat(III) PrF4- PrF4- ↔ Pr3+ + 4F- 11.54