Titration

Question 1

What is volumetric analysis?

Answer 1

A versatile form of quantitative chemical analysis

Question 2

What is the purpose of volumetric analysis?

Answer 2

To use an accurately known volume and concentration of one solution to find accurate concentration of a second

Question 3

What does volumetric analysis involve?

Answer 3

The careful measurement of volumes of solutions

Question 4

What is the measuring device used in titrations?

Answer 4

A burette

Question 5

Define volumetric analysis.

Answer 5

Analysis of a solution (Solution A) through incremental addition of a reagent solution (solution B) until the reaction is complete

Question 6

What are the two main applications of titrations?

Answer 6

Determining purity

Determining concentration

Question 7

What are the four types of titrations?

Answer 7

Acid-base
Complexometric
Redox
Precipitation

Question 8

What is an analyte?

Answer 8

The substance being analysed

Question 9

What is a titrant?

Answer 9

Solution in the burette

Question 10

What does a titration measure?

Answer 10

The volume of one reagent required to react with a measured mass or volume of another reagent

Question 11

What is a titration used for?

Answer 11

To determine the amount of acid or base present in a sample

Question 12

What is an indicator used forf?

Answer 12

To signal the endpoint when

Question 13

What is the purpose of a burette in a titration?

Answer 13

It delivers the titrant into a conical flask

Question 14

What is the definition for a titration?

Answer 14

An analytical procedure whereby we react a known volume of solution of known concentration with a known volume of a solution of unknown concentration

Question 15

What chemical is placed in the burette?

Answer 15

The chemical of known concentration

Question 16

What is placed in the conical flask?

Answer 16

A specific volume of the unknown with the indicator

Question 17

What is a standard solution?

Answer 17

A solution of known concentration

Question 18

What is a primary standard?

Answer 18

A standard solution which has been prepared by accurately weighing out a pure compound and using it to make a solution of known volume

Question 19

What is a secondary standard?

Answer 19

A solution standardised against a primary standard

Question 20

What are the five requirements for a primary standard?

Answer 20

It should be 100% pure

Stable to drying temperatures. Stable at room temperature.

Readily available and fairly inexpensive

High formula (molecular) weights so that a larger weight is taken for a given number of moles

Should react completely to give a sharp end point

Question 21

Give an example of a primary standard for the titration of acids.
(3)

Answer 21

Sodium carbonate

TRIS

Oxalic acid

Question 22

Give an example of a primary standard for the titration of bases.
(2)

Answer 22

Potassium hydrogen phthalate

Potassium hydrogen iodate

Question 23

Give an example of a primary standard for redox titrations.

Answer 23

Potassium dichromate

Question 24

Give an example of a secondary standard.

Answer 24

Sodium Hydroxide

Question 25

Give some characteristics of a secondary standard.

4

Answer 25

Solution standardised against a primary standard

May not be pure

May deteriorate once the container is opened

May deteriorate once it has been prepared

Question 26

What is the equivalence point?

Answer 26

The moment at which the reaction has gone to completion

Question 27

What is the end point?

Answer 27

The point where an indicator changes colour