Kinetics and Mechanism of Oxidation of L-Ascorbic Acid by Pt(IV)(aq) in Aqueous Hydrochloric Acid Medium

Figure 3

(a) UV-VIS spectral scan of reaction mixture of L-ascorbic acid and sodium hexachloroplatinate, [H⁺] = 0.14 mol dm⁻³, 𝐼=0.5 mol dm⁻³ at 303 K. (1) (L-ascorbic acid) = 1.0×10⁻¹ mol dm⁻³, (2) (sodium hexachloroplatinate) = 5.0×10⁻³ mol dm⁻³, (3) immediately after mixing, (4) after 15 minutes, curve (5–8) Δ𝑡=5 minutes. (b) Inset: spectra of the above reaction mixture after 24 hr.