12:50 PM G81 iiv00 3/27/2017 01:02 AM Print Calculator Periodic Table of 27 Inco

Question

12:50 PM G81 iiv00 3/27/2017 01:02 AM Print Calculator Periodic Table of 27 Inco ral Chemistry 4th Edition University Science Books presented by Sapling Learning The quantity of antimony in a sample can be determined by an oxidation-reduction titration with an agent. sample of stibnite, an ore of antimony, is dissolved in hot, concentrated HCl(aq) and passed over a agent so that all the antimony is in the form The unbalanced (aqx is oxidized by 26.7 mL of of Sb3 equation for the reaction is Bros aq Sb (aq) Br (aa) sbs (ag) (unbalanced) 3+ Calculate the amount of antimony in the sample and its percentage in the ore. Number 41AA e Previous Give Up & View Solution Check Answer e Next a Exit

Explanation / Answer

Balanced equation for the reaction :

BrO3-(aq) + 3Sb3+(aq) + 6H+(aq) ---------> Br-(aq) + 3Sb5+(aq) + 3H2O(l)

So 1 mole of BrO3- react with 3 moles of Sb3+

moles of BrO3- = 0.140 M x 26.7 ml = 3.738 mmol

moles of Sb3+ present = 3 x 3.738 = 11.214 mmol

amount of Sb present = 3.738 mmol x 10^-3 x 121.76 g/mol

amount of Sb present = 1.36 g

mass% of Sb in the sample = 1.365 x 100/6.59

mass% of Sb in the sample   = 20.72%

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