Answered: The quantity of antimony in a sample…

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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The quantity of antimony in a sample can be determined by an oxidation–reduction titration with an oxidizing agent. A 7.69 g7.69 g sample of stibnite, an ore of antimony, is dissolved in hot, concentrated HCl(aq)HCl(aq) and passed over a reducing agent so that all the antimony is in the form Sb3+(aq).Sb3+(aq). The Sb3+(aq)Sb3+(aq) is completely oxidized by 34.9 mL34.9 mL of a 0.125 M0.125 M aqueous solution of KBrO3(aq).KBrO3(aq). The unbalanced equation for the reaction is

BrO−3(aq)+Sb3+(aq)⟶Br−(aq)+Sb5+(aq)(unbalanced)BrO3−(aq)+Sb3+(aq)⟶Br−(aq)+Sb5+(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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