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Chemistry, 21.04.2020 19:04 annette211pdd8v9
The quantity of antimony in a sample can be determined by an oxidation–reduction titration with an oxidizing agent. A 7.79 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 32.7 mL of a 0.135 M aqueous solution of KBrO3(aq). The unbalanced equation for the reaction is BrO−3(aq)+Sb3+(aq)⟶Br−(aq)+Sb5+(aq) (unbalanced) Calculate the amount of antimony in the sample and its percentage in the ore.
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