ABSTRACT: The presence of triiodide, I3
−, throughout the lifetime of a persulfate−iodide
reaction with persulfate in excess, is controlled by an opposing effect of falling iodide
concentration and rising iodine concentration. This brings triiodide to a concentration
maximum, [I3
−]max, which can be studied by UV−visible spectroscopy using absorbance
measurements taken over an extended iodine clock time-scan. Equilibrium and conservation
equations can be combined so that, together with [I3
−]max, a value of the constant K for the
equilibrium established between iodine, iodide, and the triiodide complex ion can be obtained.
ABSTRACT: The presence of triiodide, I3−, throughout the lifetime of a persulfate−iodidereaction with persulfate in excess, is controlled by an opposing effect of falling iodideconcentration and rising iodine concentration. This brings triiodide to a concentrationmaximum, [I3−]max, which can be studied by UV−visible spectroscopy using absorbancemeasurements taken over an extended iodine clock time-scan. Equilibrium and conservationequations can be combined so that, together with [I3−]max, a value of the constant K for theequilibrium established between iodine, iodide, and the triiodide complex ion can be obtained.
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