III Flashcards
0
Q
Pptant of Group 3
A
6 M NH4Cl, NH4OH, H2S
or (NH4)2S
or NH4Cl, NH3, H2S
1
Q
Name of Group 3
A
Ammonium Sulfide or Al-Fe group
2
Q
Members of Grp 3
A
Al Group: Al^+3, Cr^+3, Zn^+2
Fe Group: Mn^+2, Fe^+2&3, Co^+2, Ni^+2
3
Q
Products formed when grp pptant is added to Group 3
A
Al Group: Al(OH)3, Cr(OH)3, ZnS
Fe Group: MnS, FeS, Fe2S3, CoS, NiS
4
Q
What should be added to separate Al Group from Fe Group
A
NaOH, Na2O2
5
Q
Ppt and centr. after adding NaOH, Na2O2 to Group 3
A
(soluble: Al Group) : Al^+3, Cr^+3, Zn^+2
(insoluble: Fe Group) : MnO2•H2O, Fe(OH)3, Co(OH)3, Ni(OH)3
