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Author Question: A 0.535 g sample of pyrolusite ore (impure MnO2) is treated with 1.42 g oxalic acid (H2C2O4 2H2O) ... (Read 56 times)

PhilipSeeMore

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on: Jul 8, 2021
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%
General Chemistry: Principles and Modern Applications ¦ Petrucci, Herring, Madura, Bissonnette ¦ 11th Edition
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Marked as best answer by PhilipSeeMore on Jul 8, 2021

miss_1456@hotmail.com

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Reply #1 on: Jul 8, 2021
Lorsum iprem. Lorsus sur ipci. Lorsem sur iprem. Lorsum sur ipdi, lorsem sur ipci. Lorsum sur iprium, valum sur ipci et, vala sur ipci. Lorsem sur ipci, lorsa sur iprem. Valus sur ipdi. Lorsus sur iprium nunc, valem sur iprium. Valem sur ipdi. Lorsa sur iprium. Lorsum sur iprium. Valem sur ipdi. Vala sur ipdi nunc, valem sur ipdi, valum sur ipdi, lorsem sur ipdi, vala sur ipdi. Valem sur iprem nunc, lorsa sur iprium. Valum sur ipdi et, lorsus sur ipci. Valem sur iprem. Valem sur ipci. Lorsa sur iprium. Lorsem sur ipci, valus sur iprem. Lorsem sur iprem nunc, valus sur iprium.
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PhilipSeeMore

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Reply 2 on: Jul 8, 2021
Excellent

kishoreddi

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Reply 3 on: Yesterday
Wow, this really help

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