Abstract
During cerimetric determination of solutions containing hydrogen peroxide and peroxysulfuric acid, the amount of peroxysulfuric acid consumed depends on the rate of titration. Since the same consumption occurs in the absence of hydrogen peroxide, the decomposition must be attributed to the reaction between cerium(IV) ions and peroxyaulfuric acid. Therefore, cerimetric titrations with ceric sulfate and ceric nitrate were investigated. The results showed that in the presence of sulfate ion, the amount of peroxysulfuric acid decomposed in one minute increases proportional to the concentration of Ce/sup 4+/ . The addition of Ce/sup 3+/ to the solution de creases the decomposition as a function of the ratio Ce/sup 4+//Ce/sup 3+/. The reaction between peroxysulfuric acid and Ce/sup 4+/ is more rapid in the presence of nitrate ions than sulfate ions. The reaction rate increases with the addition of Ce/sup 3/. (J.S.R.)
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