c0 PI = 0.9998 mol/dm3, c0 EO = 0.9993 mol/dm3, cNaOH = 0.2064 mol/dm3

Reaction time [min]

Relative concentration of EO (b)

k1・105

[s−1]

k3/2・105

[mol−1/2∙s−1∙dm3/2]

k2

[mol−1∙s−1∙dm3]

320

0.8057

1.13

1.19

1.26

450

0.7416

1.11

1.19

1.29

540

0.6954

1.12

1.23

1.35

650

0.6543

1.09

1.21

1.35

720

0.6239

1.09

1.23

1.40

920

0.5672

1.03

1.19

1.38

1080

0.5084

1.04

1.24

1.49

1260

0.4664

1.01

1.23

1.51

1380

0.4369

1.00

1.24

1.56

1880

0.3581

1.00

1.19

1.59

2220

0.3035

0.95

1.22

1.72

2550

0.2689

0.85

1.21

1.78

3220

0.2185

0.79

1.18

1.85

k3/2 av・105 [mol−1/2∙s−1∙dm3/2]

1.21 ± 0.02