Abstract
A thin layer of solution containing chlorite, iodide, and a star chindicator exhibits waves of chemical reactivity.The solution first turns rapidly and almost uniformly blue.Then circular colorless areas spontaneously appear and grow at a much slower rate.At higher pH’s a slow moving secondary wave of blue develops within the colorlessarea.Thecolorless waves were initiated electrically and their velocity was measured as a function of reactant concentrations. Asharpdropin[I'] appears to be the controlling factor in the wave .A simple numerical simulation gives qualitative, though not quantitative agreement with the observed dependence of the wave velocity on [C102'],[I"],and pH.