The concentration of Fe2+ in a solution is determined by titration with a 0.1869 M Ce4+ solution. The balanced net ionic equation for the reaction is: Ce4+(aq)  +  Fe2+(aq)     Ce3+(aq)  +  Fe3+(aq)    (a) If 23.90 mL of the 0.1869 M Ce4+ solution are needed to react completely with 20.00 mL of the Fe2+ solution, what is the concentration of the Fe2+ solution?  M(b) Which of the two solutions was in the buret during the titration? _________(c) Suppose at the end of the titration, the solution containing the Ce3+ ion is transferred to a volumetric flask and diluted to 250. mL. What is the concentration of Ce3+ in the diluted solution?  M

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