Solution containing unknown metal cations Add 6 M HCI Precipitate Decantate Group 1 Insoluble chlorides: Remaining cations AgCI, PLCI, Hg,C, Add HS and 0.2 M HCI Decantate Precipitate Group 2 Acid-insoluble sulfides: Cus, CdS, Bi,S, PbS, HgS, As,Sa, Sb,Sa, SnS2 Remaining cations Add (NH,)S at pH = 8 Precipitate Decantate Group 3 Base-insoluble sulfides and hydroxides: Al(OH)2, Fe(OH)a, Cr(OH)2, ZnS, NiS, MnS, Cos Remaining cations Add (NHHPO, and NH3 Precipitate Decantate Group 4 Insoluble phosphates: Caş(PO42, Sra(PO2, Baz(PO42, MGNH,PO4 Group 5 Alkali metal ions and NH,*

Fundamentals Of Analytical Chemistry
9th Edition
ISBN:9781285640686
Author:Skoog
Publisher:Skoog
Chapter17: Complexation And Precipitation Reactions And Titrations
Section: Chapter Questions
Problem 17.34QAP
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Question

(a) Precipitation of the group 4 cations of Figure  requires
a basic medium. Why is this so? (b) What is the most
significant difference between the sulfides precipitated in
group 2 and those precipitated in group 3? (c) Suggest a
procedure that would serve to redissolve the group 3 cations
following their precipitation.

Solution containing
unknown metal cations
Add 6 M HCI
Precipitate Decantate
Group 1
Insoluble chlorides:
Remaining
cations
AgCI, PLCI, Hg,C,
Add HS and 0.2 M HCI
Decantate
Precipitate
Group 2
Acid-insoluble sulfides:
Cus, CdS, Bi,S, PbS,
HgS, As,Sa, Sb,Sa, SnS2
Remaining
cations
Add (NH,)S at pH = 8
Precipitate
Decantate
Group 3
Base-insoluble sulfides and hydroxides:
Al(OH)2, Fe(OH)a, Cr(OH)2, ZnS, NiS,
MnS, Cos
Remaining
cations
Add (NHHPO, and NH3
Precipitate
Decantate
Group 4
Insoluble phosphates:
Caş(PO42, Sra(PO2, Baz(PO42,
MGNH,PO4
Group 5
Alkali metal ions
and NH,*
Transcribed Image Text:Solution containing unknown metal cations Add 6 M HCI Precipitate Decantate Group 1 Insoluble chlorides: Remaining cations AgCI, PLCI, Hg,C, Add HS and 0.2 M HCI Decantate Precipitate Group 2 Acid-insoluble sulfides: Cus, CdS, Bi,S, PbS, HgS, As,Sa, Sb,Sa, SnS2 Remaining cations Add (NH,)S at pH = 8 Precipitate Decantate Group 3 Base-insoluble sulfides and hydroxides: Al(OH)2, Fe(OH)a, Cr(OH)2, ZnS, NiS, MnS, Cos Remaining cations Add (NHHPO, and NH3 Precipitate Decantate Group 4 Insoluble phosphates: Caş(PO42, Sra(PO2, Baz(PO42, MGNH,PO4 Group 5 Alkali metal ions and NH,*
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