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Topic: Basic medium of a redox  (Read 2716 times)

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Offline Guillem_dlc

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Basic medium of a redox
« on: April 25, 2018, 04:30:31 PM »
I have the solution of the redox adjustment of this equation, but why is it a basic medium?

KAsO2+KMnO4  :rarrow: AsO3K+MnO2

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Offline Borek

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Re: Basic medium of a redox
« Reply #1 on: April 25, 2018, 05:11:05 PM »
I am not sot sure what your question is - what is a "basic medium" here?

Were you asked to balance the reaction assuming a high pH? Then just do so.
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Offline chenbeier

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Re: Basic medium of a redox
« Reply #2 on: April 26, 2018, 12:43:05 AM »
If you get MnO2 as a product in a redoxreaction the enviorment is alcaline. If it is acidic normaly you get Mn2+. So develop the reaction by using water and Hydroxide.

Offline Borek

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Re: Basic medium of a redox
« Reply #3 on: April 26, 2018, 03:07:52 AM »
If you get MnO2 as a product in a redoxreaction the enviorment is alcaline.

Closer to neutral, in really alkaline solution permanganate gets reduced to MnO42-.

Trick is, OP already listed MnO2 as a product, so predicting the product was not part of the problem.
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Offline chenbeier

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Re: Basic medium of a redox
« Reply #4 on: April 26, 2018, 08:07:38 AM »
Thats true, depending on pH. Manganate Is devleoped at pH12-14, if its below 12 to neutral 7 MnO2 is developed.

I also dont think MnO2 is the problem. The hint is to develop a redox reaction in more alcaline envirement.

Offline Guillem_dlc

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Re: Basic medium of a redox
« Reply #5 on: April 26, 2018, 08:21:11 AM »
I am not sot sure what your question is - what is a "basic medium" here?

Were you asked to balance the reaction assuming a high pH? Then just do so.

We have been taught to adjust reactions as they take place in an acidic or basic environment in one way or another. As I should do here if the problem does not specify in what way the reaction takes place.

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Offline chenbeier

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Re: Basic medium of a redox
« Reply #6 on: April 26, 2018, 01:19:17 PM »
Read everything again. If you see MnO2 then develop the equation in alcaline condition.

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