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.