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PH 105 > Complex Titrations > Flashcards

Complex Titrations Flashcards

1
Q

These are class of reactions that deal with complex formations

A

Complexation methods

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2
Q

multiple parts of ligand an donate electron

A

Chelate

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3
Q

One part of ligand can donate electron

A

Complex

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4
Q

It is highly colored dyes that are weak reducing or oxidizing agents that can be oxidized or
reduced

A

Complexation

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5
Q

it is an unstable complex

A

Group 1A metals

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6
Q

It is more stable

A

Divalent or Trivalent

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7
Q

Cheating Agent/Complexing Agent/ Complexone

A

Titrant

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8
Q

Excess e is a pair of

A

dentates

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9
Q

Metals

A

Analyte

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10
Q

if a ligand binds to a metal ionthat has only one atom

A

monodentate

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11
Q

the ability of a ligand to form more stable metal complex if there are more molecules/atoms in a ligand.

A

Chelated effect

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12
Q

has a sharper cheating effect than monodentates forming a much more stable complex

A

Multidentate ligands

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13
Q

give more stable complexes than hexadentates (EDTA), however, EDTA has the
widest general application in the analysis because of its powerful complexing action and commercial availability.

A

Octadentates (DTPA)

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14
Q

is he dissociation constant of a chemical equiatin

A

pKn or Kn

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15
Q

It implies that complex metric Titration requires __ _______ at which metals are being analyzed

A

pH Control

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16
Q

The dissociation reaction of EDTA is??

A

Dependent on pH

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17
Q

The ____ H+ in a solution, the dissociation content (K) increases (pK decreases), making the reaction proceeds backwards

A

More

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18
Q

in EDTA titrations, the _________ _________ ___, forms complexes with metal ions

A

Unprotonated ligand Y^-4

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19
Q

For successful titrations with EDTA, the Kf (as log) of the complex formed must be greater than _

A

8

20
Q

The ____ Kf of a complex, the ____ pH at which the Complexation Titration will form

A

More, Lower

21
Q

what is the minimum pH at which complexes exist? Bi3+, Fe3+

A

1 - 3

22
Q

at what minimum of pH at which complexes exist? Pb2+, Cu2+, Zn2+, Co2+, Ni2+, Mn2+, Fe2+, Al3+, Cd2+, Sn2+

A

4 - 6

23
Q

at which minimum pH does Ca2+, Sr2+, Ba2+, Mg2+ complexes exist?

A

8 - 10

24
Q

What are the factors that affect the stability of a complex?

A

Temperature
>8 pKn
Solvents
Dentate
Salt - decreasing stability

25
Q

mas maraming Solvents mas nagiging ____

A

stable

26
Q

These are organic compounds which form colored complex ions with
metal ion (in high dilution).

A

Metallochromic indicators

27
Q

Enumerate the qualities of a good in indicator

A
28
Q

They react first with the metal ion being analyzed (before the metal is
complexed by EDTA)

A

Metallochromic indicators

29
Q

What is the chemical reaction of standardization of 0.05 M Edetate Disodium

A

Complexation Reaction

30
Q

What is the type of titration of standardization of 0.05 M Edetate Disodium

A

Direct

31
Q

What is the RFIS of standardization of 0.05 M Edetate Disodium

A

Temperature
Drying
Distilled water
80 celsius
HCl

32
Q

What is the indicator of standardization of 0.05 M Edetate Disodium

A

Hydroxynapthol Blue

33
Q

What is the color transition of the endpoint of standardization of 0.05 M Edetate Disodium

A

Red to blue

34
Q

What is the factor of standardization of 0.05 M Edetate Disodium

A

1

35
Q

Zinc sulfate is commonly used as
_________ _______in residual complexometric
titrations such as in the assay of Al3+ and
Bi3+ compounds

A

Backtitrant

36
Q

standard solution must be stored in a ______ ______

A

Amber bottle

37
Q

What is chemical reaction in standardization of 0.05 M Zinc Sulfate

A

Complexometric Titration

38
Q

What is type of titration in standardization of 0.05 M Zinc Sulfate

A

Direct titration

39
Q

What is the analyte in standardization of 0.05 M Zinc Sulfate

A

Na2EDTA Disodium EDTA

40
Q

What is pH condition in standardization of 0.05 M Zinc Sulfate

A

4.6

41
Q

What is the buffer in standardization of 0.05 M Zinc Sulfate

A

Acetic acid-ammonium acetate

42
Q

What is the indicator in standardization of 0.05 M Zinc Sulfate

A

Dithiozone

43
Q

What is color transition at end point in standardization of 0.05 M Zinc Sulfate

A

Green to rose-pink

44
Q

Factors that affect EDTA titration

A

Proper pH condition
Attainment of endpoint
Temperature
Amount of Metallochromic indicators

45
Q

What are the most common metallochromic indicators

A

Dithiozone
Eriochrome Black
Hydroxynapthol Blue
Solochrome Black

46
Q

is a compound capable of forming a Complexation reaction a t a favorable pH condition

A

Masking Agent

PH 105 (6 decks)

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