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AnaChem LAB > Anachem Experiment 2 > Flashcards

Anachem Experiment 2 Flashcards

1
Q

What are the 7 group 3 cations

A

iron
cobalt
nickel
aluminum
manganese
zinc
chromium

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2
Q

group 3 cations are precipitated in a solution containing…

A

Ammonia, ammonium chloride, ammonium sulfide

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3
Q

Precipitate is a mixture of

A

sulfides and hydroxides

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4
Q

Soluble group 3 cations

A

Chromium
Zinc
Aluminum hydroxides

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5
Q

Insoluble group 3 cations

A

Manganese
Iron
Nickel
Cobalt

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6
Q

ammonia

A

NH4OH

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7
Q

ammonium chloride

A

NH4Cl

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8
Q

ammonium sulfide

A

(NH4)2S

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9
Q

Makes the solution basic

A

3F KOH (Potassium Hydroxide)

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10
Q

If all precipitate dissolved, it indicates..

A

Absence of Ni and Co (Nickel and Cobalt)

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11
Q

Color of ALUMINUM ION precipitate

A

RED

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12
Q

Red precipitate

A

ALUMINUM or NICKEL

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13
Q

Color of CHROMIUM ION

A

Blue color w/c fades rapidly

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14
Q

Blue color w/c fades rapidly

A

CHROMIUM ION

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15
Q

Color of ZINC ION

A

White precipitate

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16
Q

White precipitate

A

ZINC ION

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17
Q

Color of MANGANESE ION

A

Reddish- Purple

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18
Q

Reddish- purple

A

MANGANESE ION

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19
Q

Color of FERRIC ION

A

Deep red

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20
Q

Deep red

A

Color of FERRIC ION

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21
Q

color of COBALT ION

A

Blue-green

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22
Q

Blue green

A

Color of COBALT ION

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23
Q

Color of NICKEL ION

A

Red precipate

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24
Q

In the third day of analysis, what is used to determine the insoluble group 3 cations

A

Precipitate

25
Q

What is the first procedure in day 3?

A

Wash with 10 drops of distilled water

26
Q

What is used to dissolve the precipitate in the 3rd day of analysis?

27
Q

In the 3rd day of analysis how many drops of water is used to dilute the solution

28
Q

In the 3rd day of analysis, what are the 4 ions to be detected?

A

Manganese
Ferric
Nickel
Cobalt

29
Q

What is added to determine Manganese ion?

A

Solid sodium bismuthate
BiNaO3

30
Q

What is added to determine presence of Ferric ion?

A

2 drops of 3M NH4CNS

31
Q

What is added to determine the presence of Cobalt ion?

A

solid Sodium Fluoride
NaF

32
Q

In the 3rd day of analysis, what is added to make the solution basic?

33
Q

What is added to determine the presence of Nickel ion

A

4 drops of dimethylglyoxime

34
Q

First Day: Precipitating Agents of Group 3 Cations

A

Ammonium Chloride, Ammonia and Thioacetamide Solution

35
Q

First Day: Precipitates of Group 3 Cations

A

FeS, ZnS, MnS, CoS, NiS, Al(OH)3, Cr(OH)3

36
Q

First Day: What is the second step in experiment 2 Group 3 cations

A

Dissolve Everything in Solution using dilute acids

37
Q

First Day: What is the purpose to dilute the solution using dilute acids?

A

To dissolve ferric, aluminum, chromic, nickelous, zinc, and manganous ions.

CoS and NiS remains undissolved

38
Q

First Day: Reagent Added to dissolve CoS and NiS

39
Q

First Day: Third Step precipitating agents

A

sodium peroxide, potassium hydroxide

40
Q

First Day: Is the centrifugate soluble or insoluble?

41
Q

First Day: Is the precipitate soluble or insoluble

42
Q

First Day: Third Step MnO(OH)2 color of precipitate

43
Q

First Day: Third Step Fe(H2O)3(OH)3

A

(reddish-brown precipitate)

44
Q

First Day: Third Step Co(H2O)3(OH)3

45
Q

First Day: Third Step Ni(H2O)4(OH)2

A

green gelatinous precipitate

46
Q

Second day: Separation of Aluminum. Precipitating agent?

A

saturated ammonium chloride and dilute acetic acid

47
Q

Second day
FOURTH STEP: Precipitating agent saturated ammonium chloride and dilute acetic acid
Purpose?

A

Precipitate aluminum ion [Al(H2O)3(OH)3(colorless gelatinous precipitate)] leaving the zinc and chromic
ions in the solution

48
Q

Second day
FOURTH STEP: Confirmation for Aluminum ion: Reagent?

49
Q

Second day
FOURTH STEP:
Reaction?

A

: the red colored dye will be adsorbed by the gelatinous colorless precipitate if aluminum is
present thus giving a cranberry red/pink colored precipitate

50
Q

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

A

Barium Acetate

51
Q

FIFTH STEP: Separation of Zinc and Chromate ions (centrifugate) Precipitating agent: Barium Acetate
Purpose?

A

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

52
Q

FIFTH STEP: Separation of Zinc and Chromate ions (centrifugate)
Precipitating agent: Barium Acetate
Chemical Reaction?

A

Ba2+ + CrO4^-2↔BaCrO4

53
Q

FIFTH STEP: Separation of Zinc and Chromate ions (centrifugate)
Confirmation for Chromate ion:
Reagent:

A

Hydrochloric acid (dissolve the precipitate and separate the barium sulfate)
Hydrogen peroxide – formation of blue-colored perchromate

54
Q

FIFTH STEP: Separation of Zinc and Chromate ions (centrifugate)
Confirmation for Zinc ion (centrifugate part)
Reagent?

A

Dilute acetic acid to neutralize ammonia leaving the zinc ions free
Zn(NH3)4^2+ + 4HAc ↔Zn^2+ + 4NH4+ + 4Ac

55
Q

Third day
SIXTH STEP:

A

Addition of hydrochloric acid to dissolve the hydroxide precipitatesto make ions in free state (ionic form)

56
Q

Third day
SIXTH STEP:
Confirmation for Manganese ion
Reagents:

A

sodium bismuthate

57
Q

Third day
SIXTH STEP:Confirmation for Ferric ion
Reagents:

A

ammonium thiocyanate

58
Q

Third day
SIXTH STEP:
Confirmation for Cobaltous ion
Reagents:

A

alcoholic ammonium thiocyanate

59
Q

Third day
SIXTH STEP:
Confirmation for Nickelous ion
Reagents:

A

ammonia and dimethylglyoxime

AnaChem LAB (19 decks)

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