Kinetics and Mechanism of the Reaction between Chromium(III) and 3,4-Dihydroxy-Phenyl-Propenoic Acid (Caffeic Acid) in Weak Acidic Aqueous Solutions

Table 3

Dependence of 𝑘_2(obs) and 𝑘_3(obs) on Cr(III) concentrations at various temperatures for the reactions A−−→^𝑘2B−−→^𝑘3C. Conditions: [caffeic acid]₀ = 0.005 M, 𝐼 = 1.0 M.

𝑘2(obs)× 10^4 (s^−1)	𝑘3(obs)× 10^5(s^−1)	[Cr(III)]0(M)	𝑇 (K)
2.0	2.8	0.018	298
2.2	4.8	0.08	303
2.4	5.1	0.09	303
2.8	4.7	0.10	303
2.9	4.5	0.11	303
2.8	6.0	0.07	308
3.2	6.6	0.09	308
3.3	9.1	0.08	310
3.7	8.5	0.08	310
3.3	7.6	0.14	310