Question

C2 T13HW Question 15 - CHALLENGE

HomeworkUnanswered

Fill in the Blanks

Antimony (Sb) is a chemical element that is often used to make alloys with lead and tin. The quantity of Sb in a sample can be determined by an oxidation-reduction titration using a sample of Sb ore as the analyte and an oxidizing agent as the titrant.

Consider a reaction in which a 9.47 g sample of stibnite, an ore of Sb, is dissolved in hot, concentrated HCl(aqHCl(aq) and then passed over a reducing agent so that all the antimony is in the Sb^{3+}(aq)form. The Sb^{3+}(aq) is then completely oxidized by adding 39.8 mL of a 0.135 M aqueous solution of KBrO_3(aq), the reducing agent.

The unbalanced equation for the reaction is shown below:

H+(aq)+BrO3−​(aq)+Sb3+(aq)→Br−(aq)+Sb5+(aq)+H2​O(l)

The sum of the coefficients for the balanced redox reaction =

How many moles of antimony are there in the sample of stibnite that was reacted?------------moles

How many grams of antimony are there in the sample of stibnite that was reacted?------------g

What is the percentage of antimony in the stibnite ore?------------%

Answer 1