The quantity of antimony in a sample can be determined by an oxidation-reduction titration with an oxidizing agent. A 5.51-g sample of stibnite, an ore of antimony, is dissolved in hot, concentrated HCl(aq) and passed over a reducing agent so that all the antimony is in the form Sb3 (aq). The Sb3 (aq) is completely oxidized by 23.2 mL of a 0.135 M aqueous solution of KBrO3(aq). The unbalanced equation for the reaction is
BrO3- + Sb3+ = Br- + Sb5+
Calculate the amount of antimony in the sample and its percentage in the ore. (grams and percent)
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