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Mechanisms of Chemical Change F.2 Electron Transfer Reactions (id: a360748ed)

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admin 发表于 2024-2-5 13:33:29 | 显示全部楼层 |阅读模式
本题目来源于试卷: Mechanisms of Chemical Change F.2 Electron Transfer Reactions,类别为 IB化学

[填空题]
Titration technique cagk 1 woq*le;fkrj-4n:epjo- eoo04ogs3) n *mn be used to determine the perceq9w xwuq pd/)7ntage of copper present in a sample of copper (I) oxide. The sample is first dissolved in acidic /) w9pdx7uqq wsolution and Cu+ ions are formed. The resulting solution is then titrated against a standard solution of potassium manganate (VII),KMnO4. In acidic solution,MnO4 reacts with Cu+ to form Mn2+ and Cu2+ ions.

Titre 1 2 3
Initial burette reading/cm3 2.00 24.705.00
Final burette reading/cm3 25.80 48.30 30.60


Mass of copper oxide (I) sample/g 0.7751
Concentration of KMnO4 solution/moldm3 2.375×102
1.Using Section 24 (Section 19- 2025 Syllabus)of the Data Booklet, write the equation of the redox reaction.
2.Define reducing agent and specify the reducing agent in the reaction.
3.Calculate the number of moles of MnO4 that reacted with Cu+ cm3
4.Deduce the percentage by mass of Cu present in the sample.  %
Important note: The section numbers mentioned in the video solution are specific to the 2024 syllabus.
You can refer to the question stem to find the section numbers in the 2025 syllabus.




参考答案:
空格1: 24.33空格2: 23.7


本题详细解析:

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