Answered: .1724g of a mineral containing MnO₂ was…

Chemistry by OpenStax (2015-05-04)

1st Edition

ISBN:9781938168390

Author:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser

Publisher:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser

Chapter19: Transition Metals And Coordination Chemistry

Section: Chapter Questions

Problem 11E: Iron (II) can be oxidized to iron (III) by dichromate ion, which is reduced to chromium (III) in...

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0.1724g of a mineral containing MnO₂ was dissolved and then treated with excess iodide according to the following unbalanced reaction:

MnO₂(s) + H⁺ → Mn²⁺ + I₂ + H₂O

The I₂ released was titrated with a solution of Na₂S₂O₃ 0.07320 mol/L, requiring 14.65 mL to reach the point end of degree

a) Determine the percentage of MnO₂ in the ore.

b) When iodine solutions are used as titrants these are prepared by dissolving 1₂ in concentrated KI. Explain the reason for the need for KI in the preparation of these solutions?

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