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Analysis > Midterm > Flashcards

Midterm Flashcards

1
Q

Which of the following solution is standardized by KHC8H4O4?

A

NaOH
KOH

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2
Q

Primary standard for sodium hydroxide (NaOH)?

A

Potassium acid phthalate / KHC8H4O4

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3
Q

Standard solution in aqueous acidimetry

A

HCL
H2SO4

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4
Q

Standard solution in aqueous alkalimetry

A

NaOH
KOH

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5
Q

Factor of sodium bicarbonate?

A

NaHCO3
F=1

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6
Q

Assay of magnesium hydroxide falls under what type of assay

A

Residual acidimetric analysis

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7
Q

An unknown sample known to contain nitrogen as one of its components should be appropriately analyzed the by

A

Kjeldahl Method

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8
Q

Kjeldahl method falls under what type of quantitative analysis?

A

Residual acidimetric assay

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9
Q

Assay of sodium bicarbonate falls under what type of assay

A

Direct acidimetric assay

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10
Q

Assay of sodium hydroxide

A

Acidimetry

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11
Q

Endpoints in titrimetric procedures employing neutralization reactions are determined by

A

Potentiometers
Indicators

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12
Q

A newly synthesized drug was found to have a carboxyl group, an imide and a sulfonamide group. The first type of method consider in this drug molecule’s quantitative analysis is

A

Alkalimetry

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13
Q

Standard alkali solutions more employed for acid-base titration

A

NaOH

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14
Q

HCl can be standardized against

A

Na2CO2
Tromethamine

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15
Q

A more preferred indicator used in titrimetric procedures employing standard solutions of strong acid

A

Method red

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16
Q

When a weak acid is to be titrated with a strong base, the indicator used is

A

Phenolphthalein

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17
Q

What is the color of methyl orange in caustic soda

A

Faint yellow

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18
Q

The components of a blank used in assay of a substance are the following except

A

Analyte

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19
Q

What is the role of glycerin in the assay of boric acid

A

The reagent prevents the formation of pink color earlier than the expected endpoint

The reagent allows the reaction of protons from the acid sample with the hydroxyl ions from the titrant

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20
Q

In non-aqueous volumetric methods:

A

The temperature just controlled to prevent loss of solvent

Samples are usually organic acids and organic bases which are weak electrolytes

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21
Q

Moisture must be held to not more than how many percent in nonaqueous methods

A

0.05%

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22
Q

Which of the following is are possible samples that can be assayed by non-aqueous acidimetry?

Primary amines
Imides
nitrogen heterocycle
amides

A

Primary amines
Nitrogen heterocycle
Amides

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23
Q

What is the most suitable solvent for perchloric acid

A

Dioxane

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24
Q

A newly synthesized drug molecule was found to be a weak base and was found to be unsuitable for either direct or residual aqueous titration. If you are to titrate this using a nonpolar solvent which of the following indicators will be the most appropriate

A

Gentian violet
Crystal violet

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25
Q

Which of the followings are indicators employed in non-aqueous as acidmetry

A

Nile blue
Malachite green
Gentian violet

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26
Q

What is the color of the endpoint produced by the indicator
nile blue
malachite green
gentian violet

A

Emerald green

27
Q

What is the primary standard for lithium methoxide solutions

A

Potassium biphtalate

28
Q

What is the primary standard for perchloric acid solution

A

Potassium biphtalate

29
Q

Samples that can be assayed by non aqueous alkalimetrt includes

A

Barbiturates
Enols

30
Q

If an analyst is to employ a residual and the titration he or she is probably analyzing a sample with which of the following meta ions

A

Aluminum

31
Q

Analysis of acidic samples is known as

A

Alkalimetry

32
Q

If an analyst is to employ a direct precipitimetric method of analysis the standard solution to be used is

A

Silver nitrate

33
Q

Fajan’s titration uses _____ indicator

A

Adsorption

34
Q

The equilibrium constant for the reaction of calcium ions with disodium editate/edta is called

A

Formation constant

35
Q

Chloroform and benzene tends to ______ the stability of EDTA complex

A

Increase

36
Q

Standard solution used in nonaqueous alkalimetry

A

Lithium methoxide

37
Q

If an analyst desired to assay Mg with EDTA solution in the PRESCENCE of Al ions, the most appropriate masking agents is

A

Triethanolamine

38
Q

Thymolphthalein caustic soda is colored

A

Blue

39
Q

An analyst treated the drug sample with the exit standard silver nitrate solution and back titrated the silver nitrate in excess with standard ammonium thiocyanate. The method that this analyst employed is

A

Volhard’s method

40
Q

EOSIN Y is also known as

A

Tetrabromoflourescein

41
Q

Primary standard for sodium tetraphenylboron solution

A

Potassium biphtalate

42
Q

An analyst is to determine the amount of calcium ions in a drug sample using disodium edetate. The most appropriate indicator to use is

A

Hydroxynaphthol blue

43
Q

In silver nitrate titration

A

The method is also called argentometric titrations

The silver nitrate solution can be standardized by gravimetric method

44
Q

What is the best indicator for the analysis of aluminium compounds by titration with the disodium EDTA

A

Dithizone

45
Q

What reagent is added to prevent the hydrolysis of ferric thiocyanate form at the endpoints of volhard’s titrations

A

Nitric acid

46
Q

In residual precipitate metric methods the silver chloride formed after addition of silver nitrate in excess to the sample is prevented from reacting with ammonium thiocyanate during blank titration by addition of this reagent

A

Nitrobenzene

47
Q

Disodium EDTA is classified as a _____ ligand

A

Hexadentate

48
Q

The equilibrium constant that drives complexation reactions to completion is

A

Formation constant

49
Q

Which of the following is are true

A

The EDTA can act as a food preservative due to its capacity of inhibiting metal-catalyzed oxidation

EDTA is less water soluble compared to the sodium EDTA

There are four carbonyl oxygens and two nitrogen atoms that can serve as ligands in the EDTA molecules and donate electron pairs to metals

50
Q

What is the primary standard for disodium EDTA solutions?

A

Calcium carbonate

51
Q

What are the masking agents

A

Thioglycol
Potassium cyanide

52
Q

Ferric chloride titrations are employed in the analysis of

A

Flourides

53
Q

What is the indicator employed in ferric chloride titration

A

Potassium thiocyanate

54
Q

Statements that are true regarding metal ion indicators

A

Metal ion indicators are also complexing agents

Metal ion indicators must give up to metal under analysis to the titrant employed as complexing agent

metal ion indicators like masking agents and EDTA have ligands for attachment of metal ions

55
Q

The purity and strength of chemicals and drugs of the USP/NF is usually expressed in terms of

A

Percentage

56
Q

The process by which the exact concentration of a solution is determined

A

Standardization

57
Q

Neutralization reactions and titrimetric methods of analysis maybe

A

Alkalimetry

58
Q

The endpoint using crystal violet as an indicator is

A

Greenish blue color

59
Q

Type of essay employed for determining % ZnO in a sample of zinc white powder using EDTA as titrant

A

Volhard’s method

60
Q

Ferric alum TS is used as an indicator in volumetric precipitation if the titrant is

A

0.1 N NH4SCN

61
Q

Metal ion indicators

A

Murexide
Calmagite
Pryocathecol blue

62
Q

HCl + CaCO3 will react to form a primary product known as

A

Carbonic acid
Calcium hydroxide
NOTA DAW EH

63
Q

Most suitable indicator to use in the titration of organic acids

A

Phenolphthalein

64
Q

Statements that are correct

A

Non aqueous alkalimetry is used when the analyte is weakly acidic

Non aqueous alkalimetry is used when the analyte is an acid halide

Non aqueous alkali metal is used when the analyte is a barbiturate

Analysis (2 decks)

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