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Anachem Prelim > Cation 3 > Flashcards

Cation 3 Flashcards

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

A

Dilute HCl

24
Q

(initial detection of Ni and Co ions)

A

Dilute HCl

25
Q

**Reagent added:;
Purpose: Dissolve CoS and NiS

A

HNO

26
Q

Separation of Group Ill into subgroups
Precipitating agents:

A

Sodium peroxide and potassium hydroxide

27
Q

Centrifugate of aluminum

A

Al(H2O)2(OH)4

28
Q

Centrifugate of Zinc

A

Zn(H2O)(OH)з

29
Q

Centrifugate of Chromic

A

Cr(H2O)2(OH)4

30
Q

Brown precipitate chemical formula

A

MnO(OH)2

31
Q

reddish-brown precipitate chemical formula

A

Fe(H2O)3(OH)3

32
Q

brown precipitate chemical formula

A

Co(H2O)з(OH)3

33
Q

green gelatinous precipitate chemical formula

A

Ni(H2O)4(OH)2

34
Q

STEP: Separation of Aluminum
Precipitating agent:

A

saturated ammonium chloride and dilute acetic acid

35
Q

Confirmation for Aluminum ion:
Reagent:

A

Aluminon, thetriammonium salt of aurintricarboxylic acid, a dye

36
Q

Separation of Zinc and Chromate ions (centrifugate)
Precipitating agent:

A

Barium Acetate

37
Q

Purpose: Precipitate chromate ion as yellow precipitate but together with barium sulfate a white precipitate

A

Barium Acetate

38
Q

Yellow precipitate chemical formula

A

BaCrO4

39
Q

Confirmation for Chromate ion:
Reagent:

A

Hydrogen peroxide

40
Q

(dissolve the precipitate and separate the barium sulfate)

A

Hydrochloric acid

41
Q

Confirmatory reagent of Chromate

A

Hydrogen peroxide

42
Q

Confirmation of Chromate

A

formation of blue-colored perchromate

43
Q

Chemical formula of Blue- colored ion

A

CrO5

44
Q

Confirmation for Zinc ion (centrifugate part)
Reagent:

A

Dilute acetic acid

Hydrogen sulfide

45
Q

to neutralize ammonia leaving the zinc ions free

A

Dilute acetic acid

46
Q

What do we get from thioacetamide

A

Sulfides

47
Q

White precipitate formula

A

ZnS

48
Q

to dissolve the hydroxide precipitates to make ions in free state (ionic form)

A

hydrochloric acid

49
Q

Confirmation for Manganese ion
Reagents:

A

sodium bismuthate

50
Q

(purple colored solution)

A

MnO4-

51
Q

Confirmation for Ferric ion
Reagents:

A

ammonium thiocyanate

52
Q

(reddish brown solution formula)

A

Fe(CNS)6^3+

53
Q

Confirmation for Cobaltous ion
Reagents:

A

alcoholic ammonium thiocyanate

54
Q

(intense blue-colored complex in the juncture of two liquids formula)

A

Co(CNS)4-

55
Q

Confirmation for Nickelous ion
Reagents:

A

ammonia and dimethylglyoxime

56
Q

(red precipitate formula)

A

NH4+

Anachem Prelim (3 decks)

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