Volumetric Analysis

Question 1

Explain volumetric analysis

Answer 1

Involves dissolving a weighed amount of sample and titrating the resulting solution with a standard solution.

Question 2

Involve measuring the volume of a solution of known concentration that is needed to react completely with the analyte.

Answer 2

Volumetric titration

Question 3

It is the progressive addition of standard solution to a solution with which it reacts.

Answer 3

Titration

Question 4

It is a solution with known concentration.

Answer 4

Standard solution

Question 5

It is a process of determining the concentration of a standard solution.

Answer 5

Standardization

Question 6

A pure dry solid substance of known chemical composition used in the direct titration.

Answer 6

Primary standard

Question 7

What are the requirements for volumetric analysis?

Answer 7

1. Accurate balance with which to weigh materials for analysis
2. Graduated instrument to measure volumes of solutions used
3. Standard solutions
4. Indicators

Question 8

It is used for measuring accurate and precise volumes of solutions.

Answer 8

Pipette

Question 9

Used for pouring measured volumes of solutions

Answer 9

Burette

Question 10

Give an example of graduated instrument to measure volumes of solutions used.

Answer 10

*Conical flask
*Wash bottles
*Funnel
*Volumetric flask

Question 11

This contain distilled water for cleaning equipment

Answer 11

Wash bottles

Question 12

It is used for mixing two solutions

Answer 12

Conical flask

Question 13

For transfer of liquids without spilling

Answer 13

Funnel

Question 14

It is used to make up accurate volumes for solutions of known concentration

Answer 14

Volumetric flask

Question 15

What are the steps in titration

Answer 15

1.) The burette is attached to a clamp stand above a conical flask
2.) The burette is filled with one of the solutions
3.) A pipette is used to measure an alliquot of the other solution into the conical flask
4.) Prepare a number of flask for repeat tests
5.) Last an indicator is added to the conical flask

Question 16

It is by dissolving a weighd amount of pure dry chemical and diluting the solution to an exactly measured volume

Answer 16

Direct titration

Question 17

Titration of a weighd portion of pure dry chemical by the solution to be standardized

Answer 17

Primary standard

Question 18

Titration of a measured volume of a solution that has itself been standardized previously

Answer 18

Secondary standard

Question 19

What are the characteristics must be present in a primary standard

Answer 19

It must be a substance with known purity and definite composition
It must be stable at the temperature for drying
Its composition must not be affected by changes in humidity
It must react quantitatively and in a known way the solution to be standardized
There must be a suitable indicator for the titration

Question 20

Properties of an ideal standard solution

Answer 20

It’s concentration should remain constant for a long time to eliminate the need for the restandardization.
Its reaction with the analyze should be rapid
Its reaction with the analyte should be nearly complete
Its reaction with the analyte could be described by a balanced equation
A method should exist for detecting the equivalence point of titration

Question 21

The standard solution is titrated directly with the sample in question

Answer 21

Direct Titration or dead stop

Question 22

An excess reagent is added to the sample in question and the excess reagent is titrated with another standard solution

Answer 22

Indirect titration

Question 23

The analyte displaces a species usually from a complex and the amount of the displaced species is determined by a titration

Answer 23

Displacement titration

Question 24

It is added to the system

Answer 24

Internal indicators

Question 25

It is allowed to react in a separate container with a few drops of the solution being titrated

Answer 25

External indicator

Question 26

What are the types of volumetric methods

Answer 26

Neutralization methods
Redox methods
Precipitimetry
Compleximetry

Question 27

An acid is titrated with a standard solution of a base

Answer 27

Acidimetry

Question 28

A base is titrated with a standard solution of an acid

Answer 28

Alkalimetry

Question 29

A titration in which the reaction between the analyte and titrant is an acid base reaction

Answer 29

Neutralization methods

Question 30

A titration in which the reaction between the analyte and titrant is a complexation reaction

Answer 30

Compleximetric titrations

Question 31

A titration in which the reaction between the analyte and titrant involves a precipitation

Answer 31

Volumetric precipitation methods

Question 32

It is a formation of secondary precipitate

Answer 32

Mohr method

Question 33

Formations of colored adsorption compound

Answer 33

Fajan’s method

Question 34

Formation of colored complex ion

Answer 34

Volhard method

Question 35

A titration in which the reaction between the analyte and the titrant is an oxidation reduction reaction

Answer 35

Redox titrations

Question 36

Draw the titration set up

Answer 36

Clamp,iron stand.
- Burette containing standardized solution(titrant)
-Conical/Erlenmeyer flask containing analyte (unknown concentration) have an indicator

Question 37

Draw the titration set up

Answer 37

Clamp,iron stand.
- Burette containing standardized solution(titrant)
-Conical/Erlenmeyer flask containing analyte (unknown concentration) have an indicator