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PHAN 1 LEC > Complexometry > Flashcards

Complexometry Flashcards

1
Q

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

Complexation Method uses:

A

Calcium (Ca)
Copper (Cu)
Mercury (Hg)
Magnesium (Mg)
Zinc (Zn)
Aluminum (Al)
Bismuth (Bi)

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3
Q

EDTA will react with metal ions to form a water-soluble stable complex or a ?

A

chelate compound

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4
Q

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

A

complex

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5
Q

The complex is called a chelate if?

A

If the combining molecule contains two or more groups that donate electrons.

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6
Q

The groups bound to the central ion are called ?

A

Ligands

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7
Q

Types of Ligands

A

1,4,7-triazaheptane

Ethane-1,2-diamine

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8
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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9
Q

Stability constants should be greater than ?

A

greater than 8

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10
Q

These elements forms very weak complex.

A

Li, Na

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11
Q

Ks is below 8

A

Ag and Ba

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12
Q

Colored metals

A

Fe and Cu

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13
Q

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

A

Indicators

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14
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
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15
Q

Qualities of a good indicator are:

_________ of color change at the endpoint

A

sharpness

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16
Q

Qualities of a good indicator are:

___________ of the indicator for the metal ion under the conditions of the analysis

A

specificity

17
Q

Qualities of a good indicator are:

____________ 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.

A

stability constant

18
Q

Indicators

A

Eriochrome black
Dithiazone
Hydroxynaphthol blue

19
Q

The indicator used is __________________ for Calcium containing compounds. (deep blue)

A

hydroxynaphthol blue

20
Q

Zinc compounds and their preparations requires ?

A

Eriochrome black T.S. (red to blue)

21
Q

Standard Solution

EDTA -
Primary Standard -
Indicator -
Ligand -

A

EDTA-disodium EDTA solution 0.05M

Primary Standard: calcium carbonate

Indicator: hydroxynaphthol blue (endpoint - appearance of a deep blue color)

Hexadentate ligand

22
Q

Used for assay Ca, Mg and Zn

A

Calcium chloride

Zinc sulfate

Ca in water or water hardness

23
Q

Used for assay of Al, Bi compounds

  • Residual EDTA is determined using ?
A

Metal-ion solution (Zinc sulfate) and stable indicator (dithiazone)

24
Q

Metal ions(minerals) that are dissolved in the ground water.

A

Hardness of Water

25
Q

Hardness of Water

Temporary and Permanent (__________________________________)

A

Ca2+, Mg2, Fe3+ and SO₄

26
Q

measure of the capacity of the water to precipitate soap

A

Soap scum, clog pipe

27
Q

Hardness of Water, ppm

A

parts per million

28
Q

Hardness of Water

0 to <75

A

Soft

29
Q

Hardness of Water

75 to <150

A

Medium hard

30
Q

Hardness of Water

150 to <300

A

Hard

31
Q

Hardness of Water

300 and greater

A

Very hard

32
Q

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

A

Complexometry - Masking

33
Q

Complexometry - Masking may proceed by adjusting the the pH or with the use of ?

A

auxilliary complexing agents

34
Q

Salts formed between calcium and magnesium are salts of bicarbonate.

CAN be removed by boiling.

E.g. Calcium carbonate, Magnesium carbonate

A

Temporary Water

35
Q

Examples of Temporary Water

A

Calcium carbonate
Magnesium carbonate

36
Q

Permanent - anions that forms salt with Ca and Mg are sulfates.

CANNOT be removed by boiling.

E.g. Calcium sulfate, Magnesium sulfate (Ca2+, Mg+2, Fe3+ and SO4-)

A

Permanent Water

37
Q

Examples of Permanent Water

A

Calcium sulfate
Magnesium sulfate
(Ca2+, Mg+2, Fe3+ and SO4-)

38
Q

2 types of hardness of water

A

Temporary
Permanent

PHAN 1 LEC (14 decks)

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