Complex Formation Titration Flashcards

1
Q

These are formed when metal ions react with a ligand.

A

complexes or coordination compounds

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

These are ions or molecules that have a pair of unshared electrons capable of satisfying the coordination number of the cation

A

ligands

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

The amount of covalent bonds a cation form is dictated by the?

A

coordination number

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Ligands are ions or molecules that have a pair of unshared electrons capable of satisfying the ________________________ of the cation.

A

coordination number

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

typical value of coordination number?

A

two, four, six

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

types of ligand

A
  1. monodentate
  2. bidentate
  3. polydentate
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Titrations based on complex formation, sometimes called?

A

complexometric titrations

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

examples of monodentate ligand

A
  • water
  • ammonia
  • fluoride ion
  • chloride ion
  • cyanide ion
  • thiocyanate ion
  • hydroiodide ion
  • nitrite ion
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

examples of polydentate ligand

A
  • diethylenetriamine
  • triphosphate ion
  • ethylenediaminetetraacetate ion
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

examples of bidentate ligand

A
  • ethylenediamine (en)
  • bipyridine
  • ortho-phenanthroline
  • oxalate ion
  • carbonate ion
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Formation of [Cu(NH3)4]2+ complex occur in a?

A

stepwise function

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

For any equilibrium, the larger the value of the _______________________, the more stable the product.

A

equilibrium constant

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Equilibrium constant for complex formation is called?

A

formation constant (Kf)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Most ____________________ do not have an easily identifiable end point

A

unidentate ligands

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

_________________ ligands provide sharper end point.

A

polydentate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Contain two or more atoms that can simultaneously coordinate to a central metal ion, occupying two or more coordination spheres.

A

polydentate ligands

12
Q

Chelating agents

A

polydentate ligands

13
Q

Because of the multiple bonding site, these ligands react strongly with cations, thus providing sharper end points.

A

polydentate ligands

14
Q

This is a hexadentate ligand with six binding sites, four negatively charged oxygen atoms in the carboxylate groups and two nitrogen atoms in the tertiary amino groups

A

Ethylenediaminetetraacetic acid (EDTA)

15
Q

1st and 2nd dissociation

A

carboxylic group

16
Q

3rd and 4th dissociation

A

removal of hydrogen from the amine group.

17
Q

All metal–EDTA complexes have a _________ stoichiometry

A

1:1

18
Q

name of the product of two constants

A

conditional formation constant

19
Q

The conditional formation constant is dependent on the ______________.

A

pH of solution

20
Q

it is dependent on the pH of solution

A

conditional formation constant

21
Q

classification of EDTA titration techniques

A
  • direct titration
  • back titration
  • displacement titration
  • indirect titration
22
Q

In __________________ you simply add an indicator to a buffered solution of the metal ion and titrate with standard EDTA.

A

direct titrations

23
Q

In a ________________, an excess of EDTA is added to the sample solution containing an analyte metal ion.

A

back titration

24
Q

This is useful when the analyte metal ion binds the indicator permanently, when the metal-EDTA complex is unstable, or when the metal ions form precipitates in the without EDTA.

A

back titration

25
Q

It can be used if the analyte metal ions do not have a good indicator. In this case, a metal ion-EDTA complex is added.

A

Displacement titration

25
Q

It is useful for anions which for insoluble precipitates like sulfate. Sulfate can be reacted with known amounts of Barium chloride.

A

Indirect Titration

26
Q

The precipitate BaSO4 is ________________, and the remaining solution is ______________ with standard EDTA solution.

A

filtered, titrated

27
Q

This is the most common type of EDTA titration

A

direct titration