Question

The quantity of antimony in a sample can be determined by an oxidation–reduction titration with an oxidizing agent. A 9.73 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 50.2 mL of a 0.110 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.

mass of antimony: ___________ grams

percentage of antimony: _________%

Answer 1

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