Volumetric Analysis

Question 1

It is a general term for a method in quantitative chemical analysis in which the amount of a substance is determined by the measurement of the volume that the substance occupies

Answer 1

Volumetric analysis

Question 2

It is commonly used to determine the unknown concentration of known reactant.

Answer 2

Volumetric analysis

Question 3

often referred to as titration

Answer 3

Volumetric analysis

Question 4

a laboratory technique in which one substance of known concentration and volume is used to react with another substance of unknown concentration

Answer 4

Titration

Question 5

Involves the preparations, storage, and measurement of the volume of chemicals for analysis.

Answer 5

Volumetric analysis

Question 6

Quantitative chemical analysis which determines volume of a solution of accurately known concentration required to react quantitatively with the analyte (whose concentration to be determined).

Answer 6

Volumetric titrimetry

Question 7

The volume of titrant required to just completely react with the analyte is the _____

Answer 7

titre

Question 8

A process in which a standard reagent is added to a solution of analyte until the reaction between the two is judged complete.

Answer 8

Titration

Question 9

it is the known solution placed in the burette

Answer 9

Titrant

Question 10

The unknown solution placed in the Erlenmeyer flask

Answer 10

Analyte

Question 11

Where is the analyte placed?

Answer 11

Erlenmeyer flask

Question 12

Where is the titrant placed?

Answer 12

Burette

Question 13

A reagent solution of accurately known concentration

Answer 13

• Standard solution
• Primary standard

Question 14

A process to determine the concentration of a solution of known concentration by titrating with a primary standard.

Answer 14

Standardization

Question 15

The point at which the reaction is observed to be completed

Answer 15

End point

Question 16

Serves as a signal that tells the analyst to stop adding reagent and make the final reading of on the burette

Answer 16

End point

Question 17

What is the end point referred to?

Answer 17

Signal

Question 18

The point at which an equivalent or stoichiometric amount of titrant is added to the analyte based on the stoichiometric equation.

Answer 18

Equivalent point

Question 19

What are the equipment used in Volumetric analysis or titration?

Answer 19

• Pipette
• burette
• conical flask
• wash bottles
• funnel
• volumetric flasks

Question 20

For measuring accurate and precise volumes of solutions.

Answer 20

pipette

Question 21

For mixing two solutions.

Answer 21

conical flask

Question 22

For pouring measured volumes of solutions.

Answer 22

burette

Question 23

These contain distilled water for cleaning equipment.

Answer 23

wash bottles

Question 24

For transfer of liquid without spilling.

Answer 24

funnel

Question 25

A flask used to make up accurate volumes for solutions of known concentration.

Answer 25

volumetric flasks

Question 26

requirements for successful volumetric titration

Answer 26

- Reaction must be stoichiometric, well defined reaction between titrant and analyte. - Reaction should be rapid. - Reaction should have no side reaction, no interference from other foreign substances. - Must have some indication of end of reaction, such as color change, sudden increase in pH, zero conductivity, etc. - Known relationship between endpoint and equivalence point.

Question 26

requirements for successful volumetric titration

Answer 26

- Reaction must be stoichiometric, well defined reaction between titrant and analyte. - Reaction should be rapid. - Reaction should have no side reaction, no interference from other foreign substances. - Must have some indication of end of reaction, such as color change, sudden increase in pH, zero conductivity, etc. - Known relationship between endpoint and equivalence point.

Question 27

Is a general term expressing the amount of solute contained in a given material. Expressed by different ways.

Answer 27

Concentration

Question 28

The number of moles of solute divided by the number of liters of solution containing the solute (is gram molecular weight dissolved in one liter solution).

Answer 28

Molarity

Question 29

Defined as number of equivalents of solute divided by the number of liters of solution containing the solute (gm equivalent weight dissolved in one liter of solution).

Answer 29

Normality

Question 30

Is defined as part by wt of substance which is chemically equivalent to one part by wt of hydrogen or 8 part by wt of oxygen or 35*5 part by wt of chlorine.

Answer 30

Equivalent weight

Question 31

It depends on reaction in which it takes place.

Answer 31

equivalent weight

Question 32

The branch of chemistry which deals with weight relation between reactant and product is called stoichiometry.

Answer 32

stoichiometry

Question 33

- A solution whose concentration is accurately known. - Prepared by dissolving an accurately wt quantity of highly pure material called primary standard and diluted to an accurately volume in volumetric flask. - Otherwise a solution of approximately desired concentration is titrated against the primary standard solution and concentration is determined, this is called standardization.

Answer 33

Standard solution

Question 33

- Measurements are made with reference to standards. - The accuracy of a result is only as good as the quality and accuracy of the standards used. - A standard is a reference material whose purity and composition are well known and well defined.

Answer 33

Primary standard

Question 33

Primary Standards - Used as titrants or used to standardize titrants

Answer 33

Eg. Acid base titration Na2CO3, KHP, Succinic acid, Benzoic acid, Oxalic acid Eg for redox titration: K2Cr2O7, Potassium bromate, KlO3, Socium Oxilate, arsionus trioxide Eg for PPT titrations: NaCl, KCl, KBr, Silver nitrate Eg for Complometric titration: Pure metals like Zn, Mg, Mn, and its salts

Question 34

Cheaprst kind, have not been purified well and cant be used for quantitative work

Answer 34

Technical or commercial grade