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Analytical Chemistry > Chem Lab Midterm (not part of experiment) > Flashcards

Chem Lab Midterm (not part of experiment) Flashcards

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0
Q

I Sulfate Group includes

A

SO4
HCO3
PO4

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1
Q

Anions are grouped as

A

II Sulfate Group
II Halide Group
III Nitrate Group

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2
Q

II Halide Group includes

A

Cl
Br
I
S

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3
Q

III Nitrate Group Includes

A

NO3

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4
Q

In ______ solutions only anions of Group I are precipitated by _____

A

Ammoniacal

Ba

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5
Q

In ____ solutions only anions of group II are precipitated with _____

A

HNO3

Ag

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6
Q

Reagents of Group I Sulfate anions

A

NH3

BaCl2

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7
Q

Reagents of Group II Halide ions

A

HNO3

AgNO3

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8
Q

Reagent for Group III Nitrate ions

A

NO REAGENT

for all anions of this group are soluble

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9
Q

Anions are divided into 4 groups on basis of

A

Their reactions with dilute HCl

Solubilities of their Ba and Ag salts

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10
Q

What are the 4 divisions of anions?

A

I. Visible change, gas evolution and/or formation of a precipitate with dilute HCl

II. Do not react with HCl but forms precipitates with Ba ions in neutral medium

III. Do not react with either Ba ions or HCl in neutral medium

IV. Common anions which do not react with reagents of the previous groups

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11
Q

Anions of division I

A 
HCO3
Silicate
Sulphide
Sulphite
Thiosulfate
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12
Q

Anions of division II

A

Sulphate
Phosphate
Fluoride
Borate

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13
Q

Anions of Division III

A

Chloride
Bromide
Iodide
Thiocyanate

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14
Q

Anions of Division IV

A

NO3
NO2
Chlorate ions

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15
Q

Only anion in group I that forms a strong acid

A

Sulfate

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16
Q

It is insoluble in HCl

A

BaSO4

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17
Q

All barium salts of this group dissolve in strong acid

A

Group I

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18
Q

Test for sulfate ion

A

Addition of HCl and BaCl2

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19
Q

BaSO4 produces a _____ precipitate

A

White

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20
Q

It is stable only in basic solutions

A

Sulfide

21
Q

Sulfide + acid =

A

H2S gas

22
Q

When H2S gas comes in contact with moist Pb(Ac)2 filter paper it forms ________

A

Black Lead Sulfide

23
Q

Hydrogen Sulfide has a _______ odor

A

Rotten egg

24
Q

Sulfide ion can be destroyed by reaction with strong oxidizing agents such as ______ or ______

A

Sulfite ion

HNO3

25
Q

All _____ salts are soluble

A

Nitrate

26
Q

It has no precipitation test

A

Nitrate

27
Q

Test for nitrate ions that involve reduction by ferrous ion in concentrated H2SO4

A

Brown-ring test

28
Q

What forms the brown ring during a brown ring test?

A

Nitric oxide complexes with excess ferrous ion

FeNO2 = brown-ring

29
Q

It is essential that an excess of _____ be used and that concentrated _____ is used in a brown ring test.

A

Ferrous ion

H2SO4

30
Q

Nitrate test

A

Brown-ring test

31
Q

Interferences of nitrate test

A

Presence of
• Bromide
• Iodide

The conc. H2SO4 will oxidize the halide ion to the free halogen, giving a false positive color.

32
Q

It is a moderately weak, non- volatile acid

A

Phosphate

33
Q

Phosphate ions precipitate by reaction with ______

A

Ammonium Molybdate

34
Q

PO4 + ammonium molybdate =

A

Yellow precipitate

Mixed salt, AMMONIUM PHOSPHOMOLYBDATE

35
Q

Interference in phosphate test

A

Presence of sulfide ions

36
Q

How to get rid of sulfide ions during phosphate test

A

Acidify solution with HCl and then boil it

37
Q

They are like sulfate ions - they are also ions of strong acids

A
  • Chloride
  • Bromide
  • Iodide
38
Q
  • Chloride
  • Bromide
  • Iodide

Form _____ with Ag ion in HNO3

A

Insoluble salts

39
Q

What color is Silver Chloride AgCl

A

White

40
Q

What color is AgBr?

A

Pale yellow ( slightly soluble in ammonia solution)

41
Q

What color is AgI ?

A

Yellow ( does not dissolve in ammonia)

42
Q

These ions can be confirmed by oxidation with free Cl and generating free Br or I.

A

Bromide

Iodide

43
Q

They are more soluble in hexane that in H2O and take on a distinctive color

A

Free halogens

44
Q

What color is Bromide?

A

Reddish-brown

45
Q

What color is Iodide?

A

Violet

46
Q

It forms a weak acid, carbonic acid

A

Carbonate

47
Q

It is not very soluble and breaks down forming H2O and CO2

A

Carbonic Acid

48
Q

It confirms the presence of carbonate ions

A

Effervescence

49
Q

A colorless and odorless gas released when a carbonate ion is present

A

Effervescence

50
Q

______ + carbonate solution = effervescence

A

Strong acid

51
Q

What group forms precipitate with Ag ions in dilute HNO3 medium?

A

Group III

Analytical Chemistry (3 decks)

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