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The concentration of SO32- in a solution is determined by titration with a 0.1918 M dichromate solution. The balanced net ionic equation for the reaction is: Cr2O72-(aq) + 3SO32-(aq) + 8H3O+(aq) 2Cr3+(aq) + 3SO42-(aq) + 12H2O(l) (a) If 21.92 mL of the 0.1918 M dichromate solution are needed to react completely with 20.00 mL of the SO32- solution, what is the concentration of the SO32- solution? __________ M (b) Which of the two solutions was in the buret during the titration? - The oxidizing agent or -The reducing agent (c) Suppose at the end of the titration, the solution containing the Cr3+ ion is transferred to a volumetric flask and diluted to 250. mL. What is the concentration of Cr3+ in the diluted solution? ________ M
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