Temperture (K) |
k (s-1) |
288 |
0.5 |
293 |
0.8 |
298 |
1.4 |
303 |
2.2 |
|
| (a) Effect of temperature |
Activation parameters |
Values |
Ea (kJ mol-1) |
72.5 ± 0.4 |
∆H# (kJ mol-1) |
70.0 ± 0.3 |
∆S# (JK mol-1) |
-6.7 ± 1.1 |
∆G# (kJ mol-1) |
72.0 ± 3.5 |
log A |
12.8 |
|
| (b) Activation parameters with respect to slow step of scheme 1. |
Temperature
(K) |
K1
(dm3mol-1) |
K2
(dm3 mol-1) |
288
293
298
303 |
119
79
50
33 |
0.86
1.0
1.2
1.5 |
|
| (c) Effect of temperature to calculate K1 and K2 for the oxidation of AMT by permanganate in acid medium. |
Thermodynamic quantities |
Values from
K1 |
Values from
K2 |
DH (kJ mol-1)
DS (JK-1 mol-1)
DG298 (kJ mol-1) |
-62.3
-170
-9.8 |
26.8
92.0
-1.02 |
|
| (d) Thermodynamic quantities using K1 and K2 |
| Table 2: Thermodynamic activation parameters for the oxidation
of AMT by
permanganate in acidic medium with respect to the slow step of scheme 1. |
