The quantity of antimony in a sample can be determined by an oxidation-reduction

Question

The quantity of antimony in a sample can be determined by an oxidation-reduction titration with an oxidizing agent. A 7.09-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 36.6 mL of a 0.110 M aqueous solution of KBrO3(aq). The unbalanced equation for the reaction is....

BrO3^- (aq) + Sb^3+(aq) ----> Br^- (aq) + Sb^5+ (aq) UNBALANCED

Calculate the amount of antimony in the sample and its percentage in the ore.

Explanation / Answer

Blancing the equation:

BrO3{-} + 3 Sb{3+} + 6 H{+} Br{-} + 3 Sb{5+} + 3 H2O

(0.0324 L) x (0.140 mol/L KBrO3) x (3 mol Sb / 1 mol KBrO) x (121.76 g Sb/mol) = 1.66 g Sb

(1.66 g) / (7.99 g) = 0.208 = 20.8% Sb

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