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PHAN111 > Finals T1: COMPLEXATION > Flashcards

Finals T1: COMPLEXATION Flashcards

1
Q

is the
process based on the formation of a complex substance in
the course of analysis.

A

Complexometry (complex-formation method)

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2
Q

use to detect elements like?

A

Calcium, copper, mercury, magnesium, zinc,aluminum and bismuth

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3
Q

will react with metal ions to form a water-soluble
stable complex or a chelate compound

or the common titrant in Complexometry

A

EDTA

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4
Q

EDTA chemical name

A

Ethylene diamine tetra acetic Acid

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5
Q

When a metal ion combines with a molecule which donate
electrons, the resulting compound is termed a _______?

A

Complex

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6
Q

If the combining molecule contains two or more groups that
donate electrons, this complex is called a ______

A

chelate

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7
Q

The groups bound to the central ion are called _______?

A

Ligands

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8
Q

Reason why Complexometric method is use?

A

Due to the formation of insoluble compounds, the complexometry is use to increase the solubility of the insoluble compound.

it also use to detect elements that causes hardness to the water.

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9
Q

Types of Ligands/ Chelating agent:

A

Ammonia (NH3)
Ethane-1,2-diamine (Edamine)
EDTA
1,4,7-triazaheptane (TACN)

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10
Q

measure of the strength of the
interaction between the reagents that come together to form the complex.

A

Stability constant

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11
Q

Stability constants should be greater than 8 = to ______

A

Increase complex formation

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12
Q

Element that forms very weak complex

A

Li (Lithium)
Na (Sodium)

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13
Q

Stability constants of an element that is below 8

A

Ag (Silver)
Ba (Barium)
K (Potassium)

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14
Q

an element that forms a colored metals

A

Fe (Iron)
Cu(Copper)

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15
Q

Stability constants (as log K) of
metal-EDTA complexes:
Mg2+: Magnesium

A

8.7

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16
Q

Stability constants (as log K) of
metal-EDTA complexes:
Ca2+: Calcium

A

10.7

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17
Q

Stability constants (as log K) of
metal-EDTA complexes:
Sr2+: Strontium

A

8.6

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18
Q

Stability constants (as log K) of
metal-EDTA complexes:
Ba 2+: Barium

A

7.8

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19
Q

Stability constants (as log K) of
metal-EDTA complexes:
Mn 2+ : Manganese

A

13.8

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21
Q

Stability constants (as log K) of
metal-EDTA complexes:
Fe 2+ : Iron II (Ferrous)

A

14.3

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21
Q

Stability constants (as log K) of
metal-EDTA complexes:
Co 2+ : Cobalt

A

16.3

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22
Q

Stability constants (as log K) of
metal-EDTA complexes:
Ni 2+: Nickel

A

18.6

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23
Q

Stability constants (as log K) of
metal-EDTA complexes:
Cu 2+: Copper

A

18.8

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24
Q

Stability constants (as log K) of
metal-EDTA complexes:
Zn 2+: Zinc

A

16.7

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25
Q

Stability constants (as log K) of
metal-EDTA complexes:
Cd2+: Cadmium

A

16.6

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26
Q

Stability constants (as log K) of
metal-EDTA complexes:
Hg2+: Mercury

A

21.9

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27
Q

Stability constants (as log K) of
metal-EDTA complexes:
Pb2+: Lead

A

18.0

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28
Q

Stability constants (as log K) of
metal-EDTA complexes:
Al3+: aluminium

A

16.3

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29
Q

Stability constants (as log K) of
metal-EDTA complexes:
Fe 3+: Iron III (Ferric)

A

25.1

30
Q

Stability constants (as log K) of
metal-EDTA complexes:
Y3+: Yttrium

A

18.2

31
Q

Stability constants (as log K) of
metal-EDTA complexes:
Cr3+: Chromium

A

24.0

32
Q

Stability constants (as log K) of
metal-EDTA complexes:
Na+: Sodium

A

1.7

33
Q

Stability with respect to pH of
some metal-EDTA complexes:
Zr4+; Zirconium
Hf4+; Hafnium
Th4+; Thorium
Bi3+; Bismuth
Fe3+’; Ferric

A

pH 1-3

34
Q

Stability with respect to pH of
some metal-EDTA complexes:
Pb2+; Lead
Cu2+; Copper
Zn2+; Zinc
Co2+; Cobalt
Ni2+; Nickel
Mn2+; Manganese
Fe2+; Ferrous
Al3+; Aluminium
Cd2+; Cadmium
Sn2+; Tin

A

pH 4-6

35
Q

Stability with respect to pH of
some metal-EDTA complexes:
Ca2+; Calcium
Sr2+; Strontium
Ba2+; Barium
Mg2+; Magnesium

A

pH 8-10

36
Q

Factors affecting EDTA
reaction?

A

❖ Stability constant
❖ pH ( NaOH or ammonia-ammonium chloride buffer TS)
Interfering ions (cyanide, citrate, tartrate, fluoride and other
complex-forming agents)
❖ Neutral salts - NaCl

37
Q

Interfering ions

A

cyanide,
citrate,
tartrate,
fluoride
and other complex-forming agents

38
Q

organic compounds which form colored complex ions
with metal ion in high dilutions.

A

Indicators

39
Q

Qualities of a good indicator are:

A

❖ sharpness of color change at the endpoint

❖ specificity of the indicator for the metal ion under the
conditions of the analysis

❖ stability constant smaller than that of the metal-EDTA
complex –i.e. the indicator must give up the metal ion to
the titrant EDTA for complexing and not compete with it.

40
Q

Indicators: Complexometry

A

Eriochrome black,
Dithiazone and
Hydroxynaphthol
blue.

41
Q

The indicator used is hydroxynaphthol blue for ____
containing compounds. ( ______)

A

Calcium (1)
Deep blue (2)

42
Q

Standard Solution of complexometry?

A

EDTA – disodium EDTA solution 0.05M

43
Q

Primary Standard for complexometry ?

A

calcium carbonate

44
Q

compounds and their preparations requires
Eriochrome black T.S. (_____)

A

Zinc (1)
red to blue (2)

45
Q

Common Indicator in coplexometry? (endpoint - appearance
of a deep blue color)

Hexadentate ligand

A

hydroxynaphthol blue

46
Q

Inc EDTA stability constant can cause?

A

decrease of Indicator stability constant

*this principle is the ideal proportion to have.

47
Q

Used for assay Ca, Mg and Zn
❖ Calcium chloride
❖ Zinc sulfate
❖ Ca in water or water hardness

what kind of assay they use?

A

Direct titration

48
Q

Used for assay of Al, Bi compounds
EDTA is determined using Metal-ion solution
(Zinc sulfate) and stable indicator (dithiazone)

A

Residual Titration

49
Q

metal ions(minerals) that are dissolved in the ground water can cause?

A

Hardness of water

50
Q

Temporary hardness is cause by ?

A

Ca2+, Mg+2 carbonate

51
Q

Temporary hardness can be reverse by?

A

Filtration and boiling the water
simple process only

52
Q

Permanent of water cause by the ?

A

sulfates and chlorides of calcium and magnesium in water.

53
Q

Permanent of hardness can be reverse by?

A

the need of big machine and laboratory equipments

54
Q

Concentration of Calcium
Carbonate (mg/L): 0 to <75

A

Hardness of Water rating: Soft

55
Q

Concentration of Calcium
Carbonate (mg/L): 75 to <150

A

Hardness of Water rating: Medium hard

56
Q

Concentration of Calcium
Carbonate (mg/L): 150 to <300

A

Hardness of Water rating: hard

57
Q

Concentration of Calcium
Carbonate (mg/L): 300 and greater

A

Hardness of Water rating: Very hard

58
Q

The term used to indicate the determination of a metal in the
presence of another metal

This may proceed by adjusting the pH or with the use of
auxilliary complexing agents like

A

Masking

59
Q

Zn-EDTA inactivates Hg, Cu, Bi

A

Masking: Thioglycols

60
Q

imparts alkalinity Mg-EDTA over
Al-EDTA
Fe, Al,

A

Masking: TEA (triethanolamine)

61
Q

mask the Zn, Co, Ni, Cu

A

masking: Potassium cyanide

62
Q

masking – Mg, Al, Ca?

A

masking: Ammonium fluoride

63
Q

In a solution containing the following metals: Magnesium, Zinc, Mercury,
Aluminum and Copper:

Which of these metals may form complex with EDTA if the above solution
is treated with KCN (Potassium cyanide)?

A

II. Zn only

64
Q

If the sample will be treated with triethanolamine, which of these metal/s
will be precipitated?

A

IV. Al
V. Mn

65
Q

Which of these metals will form a stable complex with EDTA at pH of 4- 6?

A

V. Mn
II. Zn
IV. Al

66
Q

Which of these metals will not form complex with thioglycol?

A

V. Mn
IV. Al
II. Zn
I. Mg

67
Q

Sodium Tetraphenylboron
Titrations chemical name and concentration?

A

Na(C6H5)4B (freshly prepared,0.02M)

68
Q

Sodium Tetraphenyl boron
Titrations : INDICATOR

A

BPB (Bromophenol blue)

69
Q

Sodium Tetraphenyl boron
Titrations react on what compound?

A

Potassium dichromate by gravimetry

70
Q

Sodium Tetraphenylboron
Titrations: Extraction Indicator

A

Chloroform

71
Q

protecting agent to protect amino acids.

Organic nitrogen compounds
❖ Alkaloids, amines, quaternary amine salts, ammonium,
potassium and silver ions

A

Sodium Tetraphenylboron

72
Q

thioglycol chemical name ?

A

Di mercapto propanol

PHAN111 (9 decks)

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