Answer to Question #182015 in General Chemistry for dsFD

Question

Titrant-->NaOH

Analyte--> HC2H3O2

Question-->

Find pH at HALF-WAY point

Find Volume at HALF-WAY point

Find pH at EQUIVALENCE POINT

Find Volume at EQUIVALENCE POINT

DATA-->

Volume 0.10 M HC2H3O2 used (mL)-->8.00

Volume 0.10 M NaOH added (mL)

0.00

1.00

1.50

2.00

2.50

3.00

3.50

3.98

4.00

4.01

4.05

4.10

4.12

4.13

4.15

4.20

4.25

4.31

4.35

4.40

4.45

4.50

4.51

4.61

4.70

4.75

4.77

4.80

4.81

5.01

5.21

5.40

5.60

6.10

6.50

7.10

7.50

8.40

9.50

10.50

11.50

12.50

14.00

15.00

PH

2.55

3.60

3.87

4.09

4.47

4.94

5.57

6.43

6.69

6.89

7.17

7.45

7.73

8.35

9.25

9.51

9.81

9.94

10.15

10.23

10.33

10.43

10.49

10.57

10.64

10.73

10.80

10.85

10.90

11.18

11.31

11.41

11.53

11.83

11.94

12.10

12.21

12.33

12.46

12.50

12.63

12.69

12.79

12.84

Answer 1

The colorless sodium hydroxide NaOH(aq), which is the titrant, is added carefully by means of a buret. The volume of titrant added can then be determined by reading the level of liquid in the buret before and after titration.

At the equivalence point, the pH = 7.00 for strong acid-strong base titrations.

The volume at the equivalence point can be used with the known concentration of the titrant to determine how many moles have been added to the solution. At the equivalence point the moles of added base will be equal to the moles of original acid, this allows the determination of the number of moles of original acid.