The quantity of antimony in an ore can be determined by an oxidation - reduction titration with an oxidizing agent. The ore is dissolved in hot, concentrated acid and passed over a reducing agent so that all the antimony is in the Sb^3+(aq). The Sb^3+ (aq) is completely oxidized by a an aqueous solution BrO(3)^-
BrO(3)^- + Sb^3+ ---> Br^- + Sb^5+
complete and balance the equation for this reaction in acidic solution.