Cerium(IV) is most often used as the sulfate salt in H2SO4. Best results are obtained when the acid concentration is 0.5F or higher. Cerium(IV) can not be used in basic media because it precipitates as the hydroxide salt. Although cerium(IV) solutions are intensely yellow, it is not usually used as a self indicator. A redox color indicator, potentiometer, or other end-point detection system is used.
The cerium sulfate solution has the advantages of being made from a primary standard, its solutions are stable almost indefinitely, its stability is not affected by H2SO4 concentration and the reaction involves the production of only one product, Ce(III), which is colorless. Cerium(IV) can be employed in many of the same titrations as KMnO4.Table 12-3 reviews many of the applications. Solutions of the titrant can be standardized with As2O3(osmic acid or iodide ion as catalyst), sodium oxalate, pure iron (dissolve and adjust to Fe2+), and iron(II) ammonium sulfate. Color redox indicators usually used are ferroin, 5,6-dimethylferroin, or N-phenylanthranilic acid
Te he colocado información en el comentario anterior, revísala, hay muchas otras reacciones donde el Cerio IV es usado, ahi nos meteríamos en el apasionante y hermoso mundo de la química de los radicales libres