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

  • #1
Man0uzz
1
0
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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  • #2
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.
 
  • #3
Borek said:
normality can be ambiguous
AAmmmeeeennnnn.
 
  • #4
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...
 

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

What is the purpose of titrating (COONa)2 with KMNO4 in a redox reaction?

The purpose of titrating (COONa)2 with KMNO4 in a redox reaction is to determine the normality of the (COONa)2 solution. This type of titration involves a redox reaction between the (COONa)2 solution and the KMNO4 solution, where the number of moles of one substance can be determined based on the known concentration and volume of the other substance.

How is the normality of (COONa)2 calculated in a KMNO4 titration?

The normality of (COONa)2 can be calculated in a KMNO4 titration by using the formula: Normality (COONa)2 = (Volume of KMNO4 x Normality of KMNO4) / Volume of (COONa)2. By measuring the volume of KMNO4 solution required to react completely with the (COONa)2 solution, along with the known normality and volume of the KMNO4 solution, the normality of (COONa)2 can be determined.

What indicators are commonly used in a (COONa)2 - KMNO4 titration?

Common indicators used in a (COONa)2 - KMNO4 titration include potassium iodide (KI) and starch solution. Potassium iodide is used to detect the endpoint of the titration by forming a complex with the excess KMNO4, which causes a color change. Starch solution is added to the titration mixture as an indicator for the presence of unreacted KMNO4, which forms a blue-black complex with starch.

What are some possible sources of error in a (COONa)2 - KMNO4 titration?

Some possible sources of error in a (COONa)2 - KMNO4 titration include inaccurate measurements of volumes of solutions, improper mixing of reagents, presence of impurities in the solutions, and incomplete reactions. It is important to carefully measure and mix the solutions, as well as ensure that the reactions go to completion to minimize errors in the titration.

How can the accuracy of a (COONa)2 - KMNO4 titration be improved?

The accuracy of a (COONa)2 - KMNO4 titration can be improved by using precise measuring instruments, performing multiple titrations to calculate an average, and ensuring that the reactions go to completion by allowing enough time for the reactions to occur. Additionally, proper calibration of equipment and careful handling of reagents can help improve the accuracy of the titration results.

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