3. The quantity of antimony in a sample can be determined by an oxidation-reduction titration with an oxidizing agent. A 6.47 gsample of stibnite, an ore of antimony, is dissolved in hot, concentrated HCI(aq) and passed over a reducing agent so that all theantimony is in the form Sb*(aq). The Sb (aq) is completely oxidized by 31.9 mL. of a 0.115 M aqueous solution ofKBrO, (aq). The unbalanced equation for the reaction isBro, (aq) + Sb" (aq) Br (aq) + Sb*(aq) (unbalanced)Calculate the amount of antimony in the sample and its percentage in the ore.mass of antimony:percentage of antimony:

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alculate the amount of antimony in the sample and its percentage in the ore. mass of antimony: percentage of antimony:

Principles of Modern Chemistry

8th Edition

ISBN:9781305079113

Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Chapter11: Solutions

Section: Chapter Questions

Problem 40P

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Concept explainers

Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".

Question

The quantity of antimony in a sample can be determined by an oxidation-reduction titration with an oxidizing agent. A 6.47 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 Sb*(aq). The Sb (aq) is completely oxidized by 31.9 mL. of a 0.115 M aqueous solution of
KBrO, (aq). The unbalanced equation for the reaction is
Bro, (aq) + Sb" (aq) Br (aq) + Sb*(aq) (unbalanced)
Calculate the amount of antimony in the sample and its percentage in the ore.
mass of antimony:
percentage of antimony:

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