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Exp.11.5, p.307. The change of pH during an acid base titration.

Apparatus:

25.0cm3 of the 1M various acids.            100cm3 beakers

1.0 molar alkalis (75cm3)                        timer

magnetic stirrer                         Titrating apparatus with burette

Pipette and filler                                    pH meter

Procedure:

Put 25cm3 of acid into beaker by pipette

Stand the beaker to stirrer

Connect the pH meter

Place the burette above beaker and fill it with alkali

Start stirrer and start titrating noting the time and pH (use35 cm3 of alkali altogether)

 

cm3 of alkali added

weak acid / weak base pH

strong acid / strong base pH

strong acid / weak base pH

weak acid / strong base pH

0

 2.5

0.5

0.2

2.2

 1

3.2

0.5

3.1

 2

3.6

0.5

3.4

 3

3.8

0.5

3.6

 4

3.9

0.5

 5

4.0

0.5

 6

4.1

0.5

 7

4.1

0.5

 8

4.2

0.5

 9

4.3

0.5

 10

4.4

0.5

4.3

 11

4.45

0.5

0.2

4.3

 12

4.5

0.5

 13

4.55

0.6

4.5

 14

4.6

0.6

4.5

 15

0.6

 16

4.7

0.6

0.3

 17

0.7

 18

4.8

0.7

 19

0.8

0.4

 20

4.9

0.8

 21

0.9

 22

5.0

1.1

0.5

5.2

 23

1.2

 24

5.1

1.8

0.6

5.6

 25

5.2

11.6

5.9

 26

5.3

12.0

10.7

 27

5.3

12.3

11.7

 28

5.4

12.5

12.0

 29

5.5

12.6

12.2

 30

5.6

1.1

12.3

 31

5.8

1.4

12.4

 32

6.0

2.1

 33

6.4

7.6

 34

7.6

8.0

 35

8.1

8.2

 36

8.4

8.4

 37

8.5

12.6

 38

8.6

 39

8.8

 40

8.8

 

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