kate460

26.04.2021 • 

Chemistry

The quantity of antimony in a sample can be determined by an oxidation–reduction titration with an oxidizing agent. A 7.23 g sample of stibnite, an ore of antimony, is dissolved in hot, concentrated HCl(aq) and passed over a reducing agent so that all the antimony is in the form Sb3+(aq). The Sb3+(aq) is completely oxidized by 37.3 mL of a 0.110 M aqueous solution of KBrO3(aq). The unbalanced equation for the reaction is BrO−3(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:
g
percentage of antimony:
%

Ответ:

1910153

09.02.2022

Chemistry

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The reaction occurs in a similar way as magnesium does, but much less vigorous. Strong heating is required to make iron powder burn in oxygen. The reaction gives out a yellow showery sparks and produces a black solid. iron reacts with dilute hydrocloric acid to give iron chloride and hydrogen gas.

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