c₀ SI = 4.0012 mol/dm³

c₀ EO = 0.2508 = mol/dm³

c_NaOH = 0.2014 mol/dm³

Reaction time [min]

Relative concentration of EO (b)

k₁・10⁵ [s⁻¹]

130

0.8075

2.74

180

0.7487

2.68

230

0.6985

2.60

260

0.6625

2.64

320

0.6047

2.62

390

0.5468

2.58

450

0.4929

2.62

490

0.4508

2.71

580

0.4060

2.59

660

0.3499

2.65

750

0.3021

2.66

890

0.2508

2.59

10,300

0.2005

2.60

k_1/2 av・10⁵ [s⁻¹]

2.64 ± 0.05