It is shown by means of direct spectrophotometry in the UV and visible ranges that the only prod uct of the O 3 reaction with Cl -(aq) in an acidic medium is molecular chlorine Cl 2 ; in solutions, it is in equi librium with the complex ion . It is found that the consumption of one ozone molecule corresponds to the formation of one chlorine molecule. The stoichiometric equation for the reaction is obtained.
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