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[1ST YEAR] PH 105 - Pharmaceutical Analysis I (Lec) > MIDTERM 01 - Complexation Titrations > Flashcards

MIDTERM 01 - Complexation Titrations Flashcards

1
Q

These are a class of reactions that deal with complex formation

A

Complexation reaction

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2
Q

Resulting complex when a ligand contains two or more molecules/groups that can donate electrons

A

Cheleate

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3
Q

Electron donor

A

Ligand

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4
Q

Electron acceptor

A

Metal ion

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5
Q

Most commonly used analytical reagent for complexation reaction

A

Na2EDTA

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6
Q

When a ligand binds to a metal ion through only one atom

A

Monodentate

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7
Q

When a ligand binds to a metal through two atoms

A

Bidendate

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8
Q

When a ligand binds to a metal ion through four atoms

A

Tetradentate

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9
Q

When a ligand binds to a metal ion through six atoms

A

Hexadentate

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10
Q

When a ligand binds to a metal ion through eight atoms

A

Octadentate

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11
Q

When a ligand binds to a metal ion through more than one ligand atom

A

Multidentate/chelating ligand

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12
Q

Ammonia

A

Monodentate

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13
Q

Water

A

Monodentate

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14
Q

Halides

A

Monodentate

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15
Q

Glycine

A

Bidentate

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16
Q

Ethylenediamine

A

Bidentate

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17
Q

Nitriloacetic acid (NTA)

A

Tetradentate

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18
Q

Ethylenediaminetetraacetic acid (EDTA)

A

Hexadentate

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19
Q

Egtazic acid

A

Hexadentate

20
Q

Diethylenetriaminepentaacetic acid (DTPA)

A

Octadentate

21
Q

Equilibrium constant for the reaction of a metal with a ligand

A

Function constant/stability constant

22
Q

Ability of ligands to form more stable metal complexes

A

Chelate effect

23
Q

Association constant of a chemical reaction

A

pKn value/Kn

24
Q

Used in EDTA titrations; these are organic compounds which form colored complex ions with metal ion

A

Metallochromic indicators

25
Q

Type of titration (Standardization of 0.05 M Na2EDTA)

A

Direct titration

26
Q

Type of titration (Standardization of 0.05 M ZnSO4.7H20)

A

Direct titration

27
Q

Analyte (Standardization of 0.05 M Na2EDTA)

A

Chelometric calcium carbonate

28
Q

Analyte (Standardization of 0.05 ZnSO4.7H2O)

A

Na2EDTA

29
Q

Volumetric solution (Standardization of 0.05 M Na2EDTA)

A

0.05 M Na2EDTA

30
Q

Volumetric solution (Standardization of 0.05 M ZnSO4.7H2O)

A

0.05 M ZnSO4.7H2O

31
Q

Buffer (Standardization of 0.05 M Na2EDTA)

A

NaOH

32
Q

Buffer (Standardization of 0.05 M ZnSO4.7H2O)

A

Acetic-acid ammonium acetate

33
Q

Indicator (Standardization of 0.05 M Na2EDTA)

A

Hydroxynaphthol blue

34
Q

Indicator (Standardization of 0.05 M ZnSO4.7H2O)

A

Dithizone

35
Q

Color transition (Standardization of 0.05 M Na2EDTA)

A

Red to blue

36
Q

Color transition (Standardization of 0.05 M ZnSO4.7H2O)

A

Green to rose pink

37
Q

Purpose of using distilled water

A

Because there is no presence of dissolved ions in distilled water

38
Q

Purpose of drying at 110°C

A

To remove moisture

39
Q

Purpose of cooling in desiccator

A

To ensure the right temperature

40
Q

Purpose of diluted hydrochloric acid (HCl)

A

To dissolve the calcium carbonate (CaCO3)

41
Q

Purpose of using sodium hydroxide TS as a buffer

A

So that that complex would be stable and any magnesium present as a contaminant would not react

42
Q

Purpose of using acetic acid ammonium acetate as a buffer

A

Since dithizone gives a transition color at this condition

43
Q

Purpose of using amber bottle in storing ZnSO4 standard solution

A

Because zinc sulfate is sensitive to heat

44
Q

Is a method in which unwanted purities in the analyte are masked by chemical reagents

A

Masking

45
Q

Is a compound capable of forming a complexation reaction at a favorable pH condition

A

Masking agent

[1ST YEAR] PH 105 - Pharmaceutical Analysis I (Lec) (12 decks)

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