TOPIC 4: Volumetric Analysis

Question 1

The determination of the VOLUME of a solution of KNOWN CONCENTRATION required to react with a given amount of substance to be analyzed.

Answer 1

Volumetric Analysis

Question 2

Importance of Volumetric Analysis

1. It is used in determining the ______ of drugs.
2. ________________ - determination of contaminants and pH.
3. ______________ - determination of salt, vit and fatty acid content.

Answer 2

1. It is used in determining the purity of drugs.
2. Water treatment - determination of contaminants and pH.
3. Food industry - determination of salt, vit and fatty acid content.

Question 3

A common laboratory method of quantitative chemical analysis where a solution of known concentration is used to determine the concentration of an unknown solution.

Answer 3

Titration

Question 4

Parts of a titration set-up:

Answer 4

1. Analyte/Titrand
2. Standard solution/ Volumetric Solution/Titrant
3. Indicator

Question 5

The chemical substance being analyzed or the active constituent in the sample.

Answer 5

Analyte

Question 6

A solution which concentration is accurately known.

Answer 6

Standard Solution

Question 7

A chemical which changes color at or very near the endpoint.

Answer 7

Indicator

Question 8

Point during a titration when an indicator shows that the amount of reactant necessary for a complete reaction has been added to a solution.

Answer 8

Endpoint (practical)

Question 9

The theoretical point at which equivalent amounts of each substance have reacted.

Answer 9

Equivalence Point / Stoichiometric Point / Theoretical Endpoint

Question 10

Reaction between an acid and a base to form salt of water.

Answer 10

Neutralization

Question 11

Reactions that from an insoluble precipitate.

Answer 11

Precipitimetry

Question 12

Reaction between metal ions and a ligand.

Answer 12

Complexometry

Question 13

Reaction that involves the - transfer of electrons.

Answer 13

Redox Titration

Question 14

Indicators are referred to as ?

Answer 14

TS or Test Solutions

Question 15

Used to avoid errors during titration.

Answer 15

Indicators

Question 16

Indicators’ usual concentration is ?

Answer 16

0.05% with 0.1 to 0.2ml of indicator used for 10ml of the analyte

Question 17

Number of moles of reactive unit in a compound which reacts or takes the place of one mole of Hydrogen ion.

Answer 17

Equivalent

Question 18

Weight that is chemically equivalent to the reacting power of one of one atomic weight of hydrogen.

Answer 18

Equivalent Weight

Question 19

1/1000 of Eq. weight is called ?

Answer 19

milliequivalent weight

Question 20

Strength in grams equivalent to milliliter of standard solution or the weight of a substance chemically equivalent to 1 ml of a standard solution.

Answer 20

Titer

Question 21

A solution of known concentration or a solution whose exact concentration is known.

Answer 21

Standard Solution

Question 22

Process of determining exact concentration of a solution.

Answer 22

Standardization

Question 23

2 Types of Volumetric Solution

Answer 23

Primary Standard
Secondary Standard

Question 24

Chemically pure solid substance almost 99.9% pure used in the standardization of a solution.

Answer 24

Primary Standard

Question 25

Substance that is not necessarily pure but whose exact purity is known.

Answer 25

Secondary Standard

Question 26

A standard solution is a commonly used ?

Answer 26

secondary standard

Question 27

To standardize only one of the solutions by using a primary standard and the other is standardized by using a secondary standard.

Answer 27

Common practice

Question 28

Primary Standard for acid solutions:

Answer 28

Anhydrous Na2CO3
CaCO3
TrisHydroxymethylAminoMethane (THAM)

Question 29

Primary Standard for alkali solutions:

Answer 29

Benzoic acid
Potassium biphthalate
Sulfamic acid