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Cerium (IV) ions are strong oxidizing agents in acid ic solution, oxidizing arsenio us acid to arsen ic acid accor ding to the following equa tion:
2Ce4+(aq)+H3AsO3(aq)+3H2O(l)→2Ce3+( aq)+H3AsO4(aq)+2H+(aq)
A sample of As2O3 weighing 0.217 g is dissolved in basic solution and then acidified to make H3AsO3. Its titration with a solution of acidic cerium{IV) sulfate requires 21.47 ml. Determine the original concentration of Ce^4+(aq) in the titrating solution
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