The iron content of iron ore can be determined by titration with a standard KMnO4 solution. The...

Question:

The iron content of iron ore can be determined by titration with a standard KMnO{eq}_{4} {/eq} solution. The iron ore is dissolved in HCl, and all the iron is reduced to Fe{eq}^{2+} {/eq} ions. This solution is then titrated with KMnO{eq}_{4} {/eq} solution, producing Fe{eq}^{3+} {/eq} and Mn{eq}^{2+} {/eq} ions in acidic solution. If it required 38.37 mL of 0.0198 M KMnO{eq}_{4} {/eq} to titrate a solution made from 0.6128 g of iron ore, what is the mass percent of iron in the iron ore?

Redox Reaction

The reaction of the permanganate ions,{eq}MnO_4^- {/eq} and the ferrous ions, {eq}Fe^{2+} {/eq} is an example of a redox reaction. In the reaction, potassium permanganate acts as the oxidizing agent. Iron is oxidized from an oxidation state of +2 to +3. The manganese atom is reduced from an oxidation state of +7 to +2.

Answer and Explanation: 1

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The balanced chemical equation for the reaction of ferrous ions and permanganate ions is shown below.

{eq}MnO_4^-\;+\;8H^+\;+\;5Fe^{2+}\;\to\;Mn^{2+}...

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Redox (Oxidation-Reduction) Reactions: Definitions and Examples

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Chapter 2 / Lesson 12
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What is a redox reaction (oxidation reduction reaction)? Learn about redox reaction examples, balancing redox reactions, and the redox reaction definition.


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