Kinetics and Mechanism of the Reaction between Chromium(III) and 2,3-Dihydroxybenzoic Acid in Weak Acidic Aqueous Solutions

Figure 2

UV-Vis spectra of Cr(III) (a) and 2,3-DHBA (b). Conditions: (a) Chromium(III) Spectrum: [Cr(III)] = 0.050 M, 𝑇=298 K. Spectrophotometric cell path 𝑑=1 cm. (b) 2,3-DHBA Spectra: [2,3-DHBA] = 0.040 M, 𝑇= 298 K. –■– 2,3-DHBA reduced, –– 2,3-DHBA oxidized (minutes), –▲– 2,3-DHBA oxidized (hours), –▾– 2,3-DHBA oxidized (a few days). Spectrophotometric cell path 𝑑=1 cm.

(a)

(b)