Abstract

The kinetics of oxidation of ascorbic acid with HgCl2 in acid ClO 4 − and Cl− media have been studied by estimating ascorbic acid ceremetrically. The stoichiometry of the reaction is represented by the equation $$2HgCl_2 + H_2 A \to Hg_2 Cl_2 + A + 2H^ + + 2Cl^ - $$ In Cl− media the following experimental rate law was observed; $$\begin{gathered} - d[H_2 A]/dt = (k'_1 /K_2 [Cl^ - ] + k'_2 + k'_3 K_3 [Cl^ - ]) \hfill \\ K[HgCl_2 ][H_2 A]/[H^ + ] \hfill \\ \end{gathered} $$ where k′1, k′2 and k′3 are the rate constants. Ionic strength does not affect the rate, whereas Cl− greatly retards the reaction.

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