Normality of (COONa)2 - KMNO4 titration (redox reaction)

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Discussion Overview

The discussion revolves around the titration of a (COONa)2 solution with a KMNO4 solution, specifically focusing on determining the Normality of the (COONa)2 solution using the equation N1V1=N2V2. Participants explore the implications of stoichiometry in redox reactions on this equation.

Discussion Character

  • Technical explanation, Debate/contested, Conceptual clarification

Main Points Raised

  • One participant proposes using the equation N1V1=N2V2 to find the Normality of the (COONa)2 solution.
  • Another participant suggests that the Normality of the KMNO4 solution may actually be 0.002M and that the Normality of oxalate is twice its concentration, indicating that the equation may not require additional stoichiometric coefficients.
  • There is a consensus among some participants that normality can be ambiguous and context-dependent.
  • One participant notes that the use of normality has been discouraged by IUPAC and other organizations for several decades.

Areas of Agreement / Disagreement

Participants generally agree that normality can be ambiguous and context-dependent, but there is no consensus on the application of stoichiometric coefficients in the equation or the implications of normality in this context.

Contextual Notes

Participants express uncertainty regarding the stoichiometry of the redox reaction and its effect on the equation, as well as the ambiguity of normality in different contexts.

Man0uzz
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We used 14ml of a KMNO4 solution of 0.01 Normality, to find the Normality of a (COONa)2 solution.
If we took 10ml of the (COONa)2 solution, what should its Normality be?

I thought about using the following equation: N1V1=N2V2

Does the stoichiometry of the redox reaction affect the equation above? Should we multiply N2V2 with 5/2 because of it?
 
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Most likely 0.01N permanganate is actually 0.002M (five equivalents per mole), and normality of oxalate is twice its concentration (two equivalents per mole in redox reactions). If so equation as written should work with no additional stoichiometric coefficients.

But you are right that normality can be ambiguous and sometimes depends on the context, so treat above just as a guess.
 
Borek said:
normality can be ambiguous
AAmmmeeeennnnn.
 
Borek said:
But you are right that normality can be ambiguous and sometimes depends on the context, so treat above just as a guess.
And I think therefore its use is discouraged for at least 40 years by IUPAC and other organizations...
 

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