Table 4 Effect of pH on k_obs at [Cr^III(HIDA)(Arg)(H₂O)₂⁺] = 2.50 × 10^-4 mol dm^-3 I = 0.20 mol dm^-3, and T = 45°C.

0.5

1.00 ± 0.04

0.92 ± 0.03

0.42 ± 0.01

0.35 ± 0.02

1.0

2.15 ± 0.06

1.83 ± 0.03

0.83 ± 0.01

0.60 ± 0.03

1.5

2.78 ± 0.08

2.57 ± 0.06

1.48 ± 0.03

1.03 ± 0.03

2.0

3.65 ± 0.12

3.30 ± 0.09

2.00 ± 0.06

1.35 ± 0.04

3.0

4.52 ± 0.2

4.27 ± 0.13

2.30 ± 0.05

2.00 ± 0.05

4.0

6.42 ± 0.3

6.23 ± 0.20

5.00 ± 0.09

3.33 ± 0.07

5.0

10.4 ± 0.7

6.67 ± 0.35

5.90 ± 0.15

3.92 ± 0.10