The quantity of antimony in a sample can be determined by an oxidation-reduction titration with an oxidizing agent. A 6.05 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 23.7 mL of a 0.145 M aqueous solution of KBrO, (aq). The unbalanced equation for the reaction is BrO, (aq) + Sb³+(aq) Br (aq) + Sb3+ (aq) (unbalanced) Calculate the amount of antimony in the sample and its percentage in the ore. mass of antimony: percentage of antimony:

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