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A 0.535 g sample of pyrolusite ore (impure MnO2) is treated with 1.42 g oxalic acid (H2C2O4 2H2O) ...

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A 0.535 g sample of pyrolusite ore (impure MnO2) is treated with 1.42 g oxalic acid (H2C2O4 2H2O) ...

A 0.535 g sample of pyrolusite ore (impure MnO₂) is treated with 1.42 g oxalic acid (H₂C₂O₄∙ 2H₂O) in an acidic medium. Following this reaction, the excess oxalic acid is titrated with 0.1000 M KMnO₄, 36.6 mL being required. What is the % MnO₂ in the ore? The reactions are:

H₂C₂O₄∙ 2 H₂O(aq) + MnO₂(s) + 2 H⁺(aq) → Mn²⁺(aq) + 4 H₂O(l) + 2 CO₂(g)5 H₂C₂O₄∙ 2H₂O(aq)+ 2 MnO₄^-(aq) + 6 H⁺(aq) → 2 Mn²⁺(aq) + 18 H₂O(l) + 10 CO₂(g)

▸ 34.4%

▸ 61.1%

▸ 2.33%

▸ 1.22%

▸ 38.9%

Textbook

General Chemistry: Principles and Modern Applications

Edition: 11^th

Authors: Petrucci, Herring, Madura, Bissonnette

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