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Anachem Prelim > Cation 3 > Flashcards

Cation 3 Flashcards

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1
Q

Group 3 cations

A

● Iron (Fe3+ ) Ion
● Cobalt (Co2+ ) Ion
● Nickel (Ni2+ ) Ion
● Zinc (Zn2+ ) Ion
● Manganese (Mn2+ ) Ion
● Aluminum (Al3+ ) Ion
● Chromium (Cr3+ ) Ion

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2
Q

The cations of Group III are precipitated in a solution containing

A

ammonia (NH 3)
ammonium chloride (NH4CI)
And ammonium sulfide (NH 4)2S.

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3
Q

group precipitate is a mixture of

A

sulfide and hydroxides

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4
Q

The high concentration of sulfide ion necessary for precipitation of Group III sulfides is obtained in an

A

ammoniacal solution.

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5
Q

This basic solution also produces the precipitation of chromium and aluminum as hydroxides in Group III.

A

ammoniacal solution.

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6
Q

These hydroxides form a soluble group when dissolved in excess KOH solution.

A

-> Chromium hydroxide
-> Zinc hydroxide
~> Aluminum hydroxide

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7
Q

These hydroxides precipitate to form an insoluble group

A
  • Manganese hydroxide
  • Iron hydroxide
  • Nickel hydroxide
  • Cobalt hydroxide
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8
Q

CENTRIFUGATE may contain

A

aluminum, chromium, and zinc ions.

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9
Q

Day 2: RESIDUE may contain

A

iron, cobalt, manganese, and nickel ions

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10
Q

confirms the presence of ALUMINUM ION.

A

red precipitate

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11
Q

confirms the presence of CHROMIUM ION.

A

Formation of a blue color which fades rapidly

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12
Q

confirms the presence of ZINC ION.

A

Formation of a white precipitate

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13
Q

Confirmatory reagent of Manganese

A

sodium bismuthate

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14
Q

confirms the presence of FERRIC ION

A

Appearance of deep red coloration

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15
Q

Reagents used to confirm presence of COBALT ION

A

solid NaF (Sodium fluoride)

10 drops of alcoholic NH4CNS

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16
Q

confirms the presence of COBALT ION.

A

Appearance of blue-green color at the junction of the 2 liquids

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17
Q

Confirmatory reagent of NICKEL ION

A

4 drops of dimethylglyoxime.

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18
Q

confirms the presence of NICKEL ION.

A

Formation of a red precipitate

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19
Q

Black

A

FeS
CoS
NiS

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20
Q

White

A

ZnS
Al(OH)3

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21
Q

Pink

A

MnS

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22
Q

Green

A

Cr(OH)3

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23
Q

Dissolve ferric, aluminum, chromic, nickelous, zinc, and manganous ions while CoS and NiS remains undissolved

24
Q

(initial detection of Ni and Co ions)

25
**Reagent added:; Purpose: Dissolve CoS and NiS
HNO
26
Separation of Group Ill into subgroups Precipitating agents:
Sodium peroxide and potassium hydroxide
27
Centrifugate of aluminum
Al(H2O)2(OH)4
28
Centrifugate of Zinc
Zn(H2O)(OH)з
29
Centrifugate of Chromic
Cr(H2O)2(OH)4
30
Brown precipitate chemical formula
MnO(OH)2
31
reddish-brown precipitate chemical formula
Fe(H2O)3(OH)3
32
brown precipitate chemical formula
Co(H2O)з(OH)3
33
green gelatinous precipitate chemical formula
Ni(H2O)4(OH)2
34
STEP: Separation of Aluminum Precipitating agent:
saturated ammonium chloride and dilute acetic acid
35
Confirmation for Aluminum ion: Reagent:
Aluminon, thetriammonium salt of aurintricarboxylic acid, a dye
36
Separation of Zinc and Chromate ions (centrifugate) Precipitating agent:
Barium Acetate
37
Purpose: Precipitate chromate ion as yellow precipitate but together with barium sulfate a white precipitate
Barium Acetate
38
Yellow precipitate chemical formula
BaCrO4
39
Confirmation for Chromate ion: Reagent:
Hydrogen peroxide
40
(dissolve the precipitate and separate the barium sulfate)
Hydrochloric acid
41
Confirmatory reagent of Chromate
Hydrogen peroxide
42
Confirmation of Chromate
formation of blue-colored perchromate
43
Chemical formula of Blue- colored ion
CrO5
44
Confirmation for Zinc ion (centrifugate part) Reagent:
Dilute acetic acid Hydrogen sulfide
45
to neutralize ammonia leaving the zinc ions free
Dilute acetic acid
46
What do we get from thioacetamide
Sulfides
47
White precipitate formula
ZnS
48
to dissolve the hydroxide precipitates to make ions in free state (ionic form)
hydrochloric acid
49
Confirmation for Manganese ion Reagents:
sodium bismuthate
50
(purple colored solution)
MnO4-
51
Confirmation for Ferric ion Reagents:
ammonium thiocyanate
52
(reddish brown solution formula)
Fe(CNS)6^3+
53
Confirmation for Cobaltous ion Reagents:
alcoholic ammonium thiocyanate
54
(intense blue-colored complex in the juncture of two liquids formula)
Co(CNS)4-
55
Confirmation for Nickelous ion Reagents:
ammonia and dimethylglyoxime
56
(red precipitate formula)
NH4+

Anachem Prelim (3 decks)

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