University Science Books presented by Sapling Learning Donald McQuarrie Peter A

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University Science Books presented by Sapling Learning Donald McQuarrie Peter A Rock Ethan Gallogly The quantity of antimony in a sample can be determined by an oxidation-reduction itration with an oxidizing agent. A 9.31-g sample of stibnite, an ore of antimony, is dissolved in hot, concentrated HCI(aq) and passed over a reducing agent so that all the antimony is in the form Sb3(ag). The Sb (aq) is completely oxidized by 42.3 mL of a 0.125 M aqueous solution of KBros(aq). The unbalanced equation for the reaction is Bros (aq)+sb'"(aq) Br-(aq)+5b5+(aq) (unbalanced) Calculate the amount of antimony in the sample and its percentage in the ore. Number 1.972 Number 20.7 There is a hint available! View the hint by clicking on the bottom divider bar on the divider bar again to hide the hint. Close Previous Give Up & View Solution e Check Answer 0 Next 8Exi

Explanation / Answer

3Sb3+ + BrO3- + 6H+ => 3Sb5+ + Br- + 3H2O

42.3 mL / (1000 mL/L) x 0.125 M (3 mol Sb3+/1 mol BrO3-) x 121.76 g/mol = 1.93 g

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