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PHA6116 LEC > Complex-Formation Titration > Flashcards

Complex-Formation Titration Flashcards

1
Q

a sample in solution is titrated with a standard solution of a ligand to form a colored complex in the presence of an indicator until the endpoint is reached

A

Complex-Formation Method / Complexation Titrimetry / Complexometric Titration

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2
Q

species with a least one unshared pair of electrons available for bond formation (e.g. H2O, NH3, X2, and most metal ion in water).

A

Ligand

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3
Q

yield complex ions or coordination compounds (product formed when a cation bonds with an electron donor species
based on its coordination number

A

Complex-Formation Method / Complexation Titrimetry / Complexometric Titration

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4
Q

produced when a metal ion coordinates with single ligand with one donor group

A

Complex

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5
Q

produced when a metal ion coordinates with single ligand with two or more donor groups

A

Chelate

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6
Q

used in the assay of substances containing metals

A

Complex-Formation Method / Complexation Titrimetry / Complexometric Titration

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7
Q

determination of hardness of water (ppm)

A

Complex-Formation Method / Complexation Titrimetry / Complexometric Titration

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8
Q

substances that render metals in the sample inactive

A

Masking agent

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9
Q

Examples of masking agent

A

Triethanolamine, Thioglycols, Potassium cyanide, Ammonium fluoride

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10
Q

masking agent that suppress Al-EDTA in presence of Mg-EDTA

A

Triethanolamine

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11
Q

masking agents that inactivate Hg and Cu, to allow titration of Zn at pH 6

A

Thioglycols

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12
Q

masks metals like Co, Ni, Cu and Zn

A

Potassium cyanide

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13
Q

masks Ca, Mg and Al, to allow titration of Zn

A

Ammonium fluoride

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14
Q

Examples: titration of Bi at pH 2, titration of Ca at pH 13

A

Adjusting the pH of solution

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15
Q

Bi is titrated at what pH?

A

2

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16
Q

Ca is titrated at what pH?

A

13

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17
Q

binds the metal cation being determined in complexometric analyses

A

Standard solutions serve as a ligand

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18
Q

EDTA by nature is what?

A

inorganic

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19
Q

8-hydroxyquinoline by nature is what?

A

organic

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20
Q

how many donor groups does glycine have?

A

2 - bidentate

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21
Q

how many donor groups does EDTA have?

A

6 - hexadentate

22
Q

Tetradentate aminopolycarboxylic acid standard solution

A

Nitrilotriacetic acid (NTA)

23
Q

Second most common complexing agent used in titrimetry

A

Nitrilotriacetic acid (NTA)

24
Q

Aminopolycarboxylic acid stadard solution and an ether analog of EDTA

A

Ethyleneglycol bis(B-aminoethylether)-N,N,N’,N’-tetraacetic acid (EGTA)

25
Q

Selectively titrates Ca in the presence of Mg ions

A

Ethyleneglycol bis(B-aminoethylether)-N,N,N’,N’-tetraacetic acid (EGTA)

26
Q

Hexadentate aminopolycarboxylic acid standard solution that is very stable dilute solutions but it is very sensitive to
pH and may be selective with reactivity with metal ions

A

Ethylenediamine tetra acetic acid (EDTA)

27
Q

Commercially available in reagent quality as a free acid (H4Y) or as a dihydrate sodium salt (Na2H2Y·2H2O)

A

Ethylenediamine tetra acetic acid (EDTA)

28
Q

primary standard of EDTA

A

CaCO3

29
Q

indicator used in EDTA

A

eriochrome black T (EBT)

30
Q

usually employed in residual titrations

A

Zinc sulfate (ZnSO4)

31
Q

indicator used in zinc sulfate

A

dithizone

32
Q

are also ligands that binds metal ions effectively and prevents its precipitation, but can still
be given up when EDTA is added

A

Auxiliary Complexing Agents

33
Q

It permits multiple metal to be titrated in alkaline solution with EDTA

A

Auxiliary Complexing Agents

34
Q

is the process of determining the conc. of metals in the presence of another metal

A

masking

35
Q

is a complexing agent that reacts selectively with a component in a solution to prevent that
component from interfering in a determination

A

masking agent

36
Q

an auxiliary agent that preferentially forms complex with
potentially interfering ions

A

masking agent

37
Q

permits titration of Mg and Ca ions in the presence of Cd, Co, Cu, Ni, Zn, and Pd as the these metals will form
stable CN-1 complexes

A

KCN (cyanide ion)

38
Q

will provided sufficient alkalinity to prevent complexation of Al-EDTA in the presence of Mg-EDTA — allowing
Mg determination

A

Triethanolamine (TEA — C6H15NO3)

39
Q

It allows complexation of Zn at pH 6 by inactivation Hg and Cu which interacts with sulfhydryl groups (-SH) in the — molecule.

A

Thioglycols

40
Q

masks Ca, Mg, and Al to allow titration of Zn.

A

Ammonium fluoride (NH4F)

41
Q

Any of these three can be used to mask Sb in an analyte solution

A

Ascorbic acid, Citrates, and Tartrates

42
Q

Direct EDTA Titrations (3)

A

Calcium, Magnesium and Zinc

43
Q

Residual EDTA Titrations (2)

A

Aluminum and Bismuth

44
Q

One of the oldest and most widely used indicator exclusive at pH 7-11; ideal for Mg titrations, but not for Ca

A

Eriochrome Black T (EBT)

45
Q

Wine red color (complexed) and turns blue color (free) at the endpoint

A

Eriochrome Black T (EBT)

46
Q

Oxidized slowly by dissolved oxygen; ascorbic acid is used to retard oxidation or solid EBT is added directly
prior to titration

A

Eriochrome Black T (EBT)

47
Q

structurally similar to EBT; with better stability in aqueous solutions

A

calmagite

48
Q

an excellent indicator for EDTA titrations with the rare earth metals. It can resist the presence of small
amount of Fe+3 during Ca and Mg titrations

A

Arsenazo I

49
Q

Ca-sensitive and can be used for Ca determination from biological samples. It can also be used for
Uranium and Thorium determination

A

Arsenazao III

50
Q

commonly used in a tetrasodium salt form and can be used in acidic solutions. It will appear red
(complexed) and turns yellow (free) at the endpoint

A

Xylenol Orange

51
Q

deep blue color at endpoint

A

Hydroxynaphthol blue

52
Q

rose pink color at endpoint

A

Dithizone

PHA6116 LEC (1 decks)

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