Unit 8 – Acid-base Titration

Question 1

It is a method of quantitative analysis for determining the concentration of an acid/base by neutralizing it with standard solution of base/acid.

Answer 1

Acid-base Titration

Question 2

Types of acid-base titration

Answer 2

Alkalimetry
Acidimetry

Question 3

It is the determination of BASIC CONTENT in a sample by titrating it with a standard acid solution.

Answer 3

Alkalimetry

Question 4

It is the determination of ACID CONTENT in a sample by titrating it with a standard acid solution.

Answer 4

Acidimetry

Question 5

T/F
In ALKALIMETRY, the BASIC CONTENT should be titrate with ACID.

Answer 5

T

Question 6

T/F
In ACIDIMETRY, the ACID CONTENT should be titrate with a standard BASIC solution.

Answer 6

T

Question 7

It is the course of an acid-base titration that is best followed by examining the pH as the titration progresses.

Answer 7

Titration Curve

Question 8

It provides a visual picture of how the property of the titration reaction changes as the titrant is added to the analyte.

Answer 8

Titration Curve

Question 9

Stages in the titration

Answer 9

Pre-equivalence point
Equivalence point – end point
Post-equivalence point

Question 10

Equivalence points in acid-base titrations are determined most often using _____ that change color at or near equivalence point.

Answer 10

Chemical indicators

Question 11

_____ are WEAK ORGANIC acids or bases whose conjugate forms have different colors.

Answer 11

Acid-base indicators

Question 12

T/F
It must be WEAKER than the ANALYTE acid or base that it reacts last with the titrant.

Answer 12

T

Question 13

An average observer visualizes color imparted by a typical indicator within concentration ratio: _____

Answer 13

[Hin] / [In-] = 10 to 0.1

Question 14

It is the point in titration having the GREATEST SLOPE.

Answer 14

Inflection point

Question 15

It very nearly coincides with the equivalence point.

Answer 15

Inflection point

Question 16

T/F
To MINIMIZE titration error, an indicator’s entire transition pH range must fall WITHIN the rapid change in pH at the equivalence point.

Answer 16

T

Question 17

This is the use of strong acids or strong bases.

Answer 17

Standard solution (titrant)

Question 18

This react more completely with an analyte, yielding a sharper endpoint.

Answer 18

Standard solution (titrant)

Question 19

It is widely used for titration of bases

Answer 19

HCl

Question 20

It is a strong acid and dilute solutions are stable with little or reducing power.

Answer 20

HCl

Question 21

T/F
Chloride ions does not form precipitates with most cations.

Answer 21

T

Question 22

It is a concentrated acid and NOT a PRIMARY STANDARD.

Answer 22

Hcl

Question 23

It forms insoluble sulfates with a number of common cations.

Answer 23

Sulfuric acid

Question 24

Standard bases used for standardization of acids.

Answer 24

Primary standard bases

Question 25

It is most often used for standardization of acid solutions.

Answer 25

Primary standard bases

Question 26

Most often used for the standardization of acid solutions.

Answer 26

Sodium carbonate

Question 27

High purity solid that are commercially available, but is hygroscopic.

Answer 27

Sodium carbonate

Question 28

It is also known as borax.

Answer 28

Sodium tetraborate

Question 29

T/F Sodium tetraborate cannot be heated to remove water.

Answer 29

T

Question 30

Sodium tetraborate is stored in dessicator over an aqueous solution saturated with _____ and _____.

Answer 30

NaCl and Sucrose

Question 31

It is used almost exclusively for titrating acids in solutions.

Answer 31

NaOH

Question 32

T/F Dilute NaOH solutions are stable and can be stored in plastic containers.

Answer 32

T

Question 33

It slowly reacts with glass to form soluble silicates.

Answer 33

NaOH

Question 34

It has a cementing property; often glass stoppers are "freeze" tightly to the mouth of the container.

Answer 34

NaOH

Question 35

T/F NaOH must be protected from oxygen.

Answer 35

F. It should be protected from carbon dioxide/