I don't understand...I thought metals form positive ions, and metals lose electrons, which means they are oxidised? But then they should be reducing agents! Why are they oxidising agents, then?
The answer from the answer key is: because they can accept or gain electrons / change into atoms or can be reduced [1]
Please explain in a simple way, thanks!
why positive ions are likely to be oxidants (oxidising agents)?
2016-06-15 11:05 am
回答 (3)
2016-06-15 12:30 pm
In the question, "Why positive ions are likely to be oxidants ?" The positive ions act as a reactant.
But you said, "..... metals form positive ions....". The positive ions are a product. We never said a product is an oxidant or a reductant.
Consider the displacement reaction of copper with silver nitrate solution.
Cu(s) + 2Ag⁺(aq) → Cu²⁺(aq)+ 2Ag(s)
Copper acts as an reductant because it is oxidized to copper(II) ions, while positive silver ions act as a oxidant because they are reduced to silver metal.
Generalize the above example, positive ions are ready to reduce to atoms, and thus they are likely to be oxidants.
But you said, "..... metals form positive ions....". The positive ions are a product. We never said a product is an oxidant or a reductant.
Consider the displacement reaction of copper with silver nitrate solution.
Cu(s) + 2Ag⁺(aq) → Cu²⁺(aq)+ 2Ag(s)
Copper acts as an reductant because it is oxidized to copper(II) ions, while positive silver ions act as a oxidant because they are reduced to silver metal.
Generalize the above example, positive ions are ready to reduce to atoms, and thus they are likely to be oxidants.
2016-06-15 2:46 pm
Oxygen can take away TOO MANY electrons, the metal ion wants some back.
2016-06-15 11:06 am
ask my grandma that question, she a scientist
收錄日期: 2021-04-18 15:05:35
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20160615030556AAVtXBZ