Table 3. Activation Parameters of Apparent Rate Constants and the Second-Order Rate Constants and Thermodynamic Parameters of Protonation Constant (K)a.
| parameter |
|||||
|---|---|---|---|---|---|
| constant | ΔH≠ (kJ mol–1) | ΔS≠(J mol–1 K–1) | ΔG293≠ (kJ mol–1) | Ea≠ (kJ mol–1) | A (mol–1 s–1) |
| ka’ | 5.57 | –293.60 | 93.07 | 8.17 | 1.19 × 102 |
| ka″ | 22.35 | –219.50 | 87.76 | 24.92 | 0.6 × 102 |
| kn | 14.37 | –249.25 | 73.05 | 16.87 | 1.62 × 102 |
| K | ΔH° (kJ mol–1) | ΔS°300 (J mol–1 K–1) | ΔG°300 (kJ mol–1) | ||
| +18.59 | +43.70 | +5.48 | |||
a
[CrO42–] = 7.0 × 10–4, [PEG] = 1.3 × 10–1, and I = 4.0 mol dm–3. Experimental error ±3%. Second-order rate constant measured at [H+] = 4.0 mol dm–3.