Autor: Jerzy Baron (baron_at_usk.pk.edu.pl)
Data: Fri 10 Sep 1999 - 15:00:42 MET DST



Mozna np. tak:
Do probowki zawierajacej ok. 2 ml 0,1m metawanadanu amonu (NH4VO3) dodac 5 kropli 12m H2SO4 i krysztalek NaHSO3. Probowke ogrzewac (uwaga: wydziela sie SO2).
Roztwor, poczatkowo zolty zmienia wielokrotnie barwe konczac na fioletowej. Zmieniajacym sie barwom odpowiada zmieniajacy sie w czasie doswiadczenia stopien utleniena wanadu:

st utl. 		barwa

+5 zolta
+5, +4 zielona
+4 niebieska
+3 zielona
+2 fioletowa

Nie pytaj skad wziac NH4VO3. Sam uzywam go tylko w cwiczeniu pokazowym, prezentujac naszym studentom I roku zmiany stopni utlenienia wybranych metali w ukladach redox(ale zamiast NaHSO3 uzywam wtedy amalgamatu cynkowego).

jb

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