Abstract
The kinetics of the oxidation of thiourea to sulfate by octacyanomolybdate(V) and octacyanotungstate(V) ions have been studied in an alkaline medium. The reactions are first order with respect to thiourea, octacyanomolybdate(V) or octacyanotungstate(V), hydroxide and sodium ions. The observed fourth order rate constants are ca. 1.20×107 and ca. 9.80×103 M−3 min−1 for oxidation by Mo(CN)83− and W(CN)83−, respectively at 298K. A reaction mechanism is proposed.
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