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Topic: Titration of oxalic acid with KMnO4  (Read 457 times)

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Offline Gameofketones

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Titration of oxalic acid with KMnO4
« on: December 12, 2020, 02:49:31 AM »
In the 4th question should I approach it quantitatively like 0.1 N oxalic acid means 0.05M oxalic acid. But then I don't have the molarity of KMNO4 to predict the titre value.

Offline AWK

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Re: Titration of oxalic acid with KMnO4
« Reply #1 on: December 12, 2020, 03:31:08 AM »
But then I don't have the molarity of KMNO4 to predict the titre value.
You are not asked about it.
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Offline Gameofketones

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Re: Titration of oxalic acid with KMnO4
« Reply #2 on: December 12, 2020, 03:32:57 AM »
Is it asking me if I would adjust in an experiment? Or should i predict if 5ml titre value is correct or not?

Offline AWK

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Re: Titration of oxalic acid with KMnO4
« Reply #3 on: December 12, 2020, 03:57:11 AM »
How do you understand this sentence?
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Offline Gameofketones

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Re: Titration of oxalic acid with KMnO4
« Reply #4 on: December 12, 2020, 03:59:17 AM »
We have not yet done the experiment. This was given as an assignment..since we can't have physical classes. So I'm guessing we can only answer this after we do the experiment..

Offline AWK

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Re: Titration of oxalic acid with KMnO4
« Reply #5 on: December 12, 2020, 04:25:20 AM »
All the questions for this exercise can be answered without knowing the specific concentration of permanganate. Moreover, for assignment 4 you can calculate the approximate values ​​of the permanganate concentration yourself if somehow it helps you better understand the problem.
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Offline Borek

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Offline Gameofketones

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Re: Titration of oxalic acid with KMnO4
« Reply #7 on: December 12, 2020, 05:22:58 AM »
I got the titrant value 5ml doing in this manner..is this anywhere close to being correct?

Offline AWK

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Re: Titration of oxalic acid with KMnO4
« Reply #8 on: December 12, 2020, 05:33:09 AM »
The greater the volume of the titrant, but not greater than the volume of the burette, the smaller the titration error.
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Offline Gameofketones

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Re: Titration of oxalic acid with KMnO4
« Reply #9 on: December 12, 2020, 08:52:02 AM »
I understand that titrant value must be greater for less errors. I'm confused because in the question they've said take either 10ml or 25ml. Should I calculate the concentration of KMnO4 and work them out separately?  Since 2 moles reacts with 5moles of oxalic acid, i got 0. 0125 moles of oxalic acid reacts with 0.005 moles of KMnO4. From the no. Of moles, I standardized it to 250ml and got 0.02M is this correct?

Offline AWK

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Re: Titration of oxalic acid with KMnO4
« Reply #10 on: December 12, 2020, 10:18:07 AM »
Usually, a smaller volume is used for pre-titration. So I understand assignment 4 is for 25mL volume. This, therefore, corresponds to a permanganate concentration of 0.1 and 0.02 M respectively.
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Offline Borek

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Re: Titration of oxalic acid with KMnO4
« Reply #11 on: December 12, 2020, 11:06:48 AM »
I'm confused because in the question they've said take either 10ml or 25ml.

Most likely to allow you to choose the volume which produces smaller error.
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