Determining Volume Strength of Hydrogen Peroxide Solution

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Discussion Overview

The discussion revolves around determining the volume strength of a hydrogen peroxide solution through titration with potassium permanganate. Participants explore the calculations involved in deriving molarity and converting it to volume strength, while addressing definitions and methodologies related to the problem.

Discussion Character

  • Homework-related
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant describes their experimental setup and results, seeking guidance on calculating volume strength from titration data.
  • Another participant questions the clarity of the original poster's problem and asks if they understand how to calculate the number of moles of hydrogen peroxide.
  • A participant expresses the need to calculate molarity first and then convert it to volume strength.
  • One participant states that knowing the mole ratio of permanganate to hydrogen peroxide does not clarify the definition of volume strength.
  • Another participant provides a formula for volume strength but requests clarification on terms like "gas present" and "factor," suggesting that definitions are necessary for understanding.
  • A later reply defines volume strength as the ratio of the volume of oxygen gas liberated to the volume of hydrogen peroxide solution used.

Areas of Agreement / Disagreement

Participants express varying levels of understanding regarding the calculation of volume strength and the definitions involved. There is no consensus on the clarity of the original problem or the definitions of key terms.

Contextual Notes

Some participants highlight the need for clearer definitions of terms used in the discussion, such as "factor" and "gas present," which may affect the understanding of volume strength calculations.

Who May Find This Useful

This discussion may be useful for students and individuals interested in analytical chemistry, particularly those learning about titration methods and the calculations involved in determining concentrations and volume strength of solutions.

clarewillow
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Determintion of the volume strength of the solution of hydrogen peroxide provided...

Homework Statement



Hi, I have to dertermine the volume strength of the solution of hydrogen peroxide provided. NOTE the volume strength as I'm not quite sure how to get this!

I had to dilute 10ml, accurately measured, of the hydrogen peroxide to 100ml with distilled water using a volumetric flask. To 10ml of the dilution, 20ml bench sulphuric acid was added and then titrated with 0.02M potassium permanganate solution.

My results where: Titration 1 : 10.6ml
Titration 2 : 10.5ml

The equation for the reaction is :

2KMnO4 + 3H2SO4 + 5H2O2 ====> K2SO4 + 2MnSO4 + 8H20 + 5O2

The molecular mass of hydrogen peroxide is 34.016

I really am stuck. I have been trying to work it out from 2 this afternoon, and now i can't even see straight :frown: If anyone can please guide me through i would be extremely grateful.

Thank you in advance :smile:



Homework Equations





The Attempt at a Solution

 
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Please try to be more specific, as it is not clear what is your problem. Do you know how to calculate number of moles of hydrogen peroxide in your sample? Do you know what is the definition of "volume strength"?
 


Hi, yes i pretty much need to know how to work out the molarity. And then i do believe i need to work out how to convert this to volume strength. Thanks for your time x
 


You still didn't answer Borek's question. Do you know how to calculate moles of hydrogen peroxide in the sample you titrated?

Hint: for every 2 moles of permanganate, you neutralize 5 moles of hydrogen peroxide.
 


knowing that the mole ratio is 2:5 doesn't change anything the real question here is what is volume strength
i think volume strenght is = factor x titre x nominal x gas present.
 


ghosty said:
volume strenght is = factor x titre x nominal x gas present.

I am doing my best to understand what you mean and I fail. What is "gas present", what is "factor" - as long as you don't define terms used, your definition is useless.

Volume strength is the ratio of the volume of oxygen gas liberated to the volume of H2O2 solution used.
 

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