II Flashcards
0
Q
Group pptant of Group 2
A
Adjust H+ concentration to 0.3 M + H2S
1
Q
Name of Group 2
A
Hydrogen Sulfide or Cu-Sn group
2
Q
Members of Group 2
A
Cu Group: Pb^+2, Cu^+2, Cd^+2, Bi^+3
Sn Group: Hg^+2, As^+3&5, Sb^+3&5 Sn^+2&4
3
Q
Products formed when grp pptant is added to Group 2
A
Cu Group: PbS, CuS, CdS, Bi2S3
Sn Group: HgS, As2S3, As2S5, Sb2S3, Sb2S5, SnS, SnS2
4
Q
What should be added to separate Cu Group from Sn Group
A
Na2S
5
Q
Ppt and centr. after adding Na2S to Group 2
A
(insoluble: Cu Grp) : PbS, CuS, CdS, Bi2S3
(soluble: Sn Grp) : Hg^+2, As^+3&5, Sb^+3&5 Sn^+2&4
