Determining the Mass percent comp. of an Aqueous Hydrogen peroxide

In summary, the conversation discusses the effect of using an assumed atmospheric pressure on the calculation of mass percent of hydrogen peroxide in a solution. The recorded barometric pressure in lab was 768.2 torr, but if an assumed value of 760 mm Hg is used instead, the calculated mass percent would likely be lower. The formula used for calculation is PV=nRT with the reaction equation 2H2O2 (aq) -> 2H2O (l) + O2 (g).
  • #1
Marie123
3
0

Homework Statement



In lab we recorded a barometric pressure of 768.2 torr. Suppose we didn't have access to a barometer and assumed that atmospheric pressure was 760 mm Hg. Would the mass percent of hydrogen peroxide that you calculated for the solution be higher or lower than the value you obtained using the actual barometric pressure.



Homework Equations





The Attempt at a Solution


I think it would be lower (I did it through calculations) but was wondering why it would be the lower or simply the science behind why it would be lower. Thanks!
 
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  • #2
Do you have a formula that you used for calculating the hydrogen peroxide from the barometric pressure?
 
  • #3
i just used pv=nrt
2H2O2 (aq) -> 2H2O (l) + O2 (g)
 

Related to Determining the Mass percent comp. of an Aqueous Hydrogen peroxide

1. What is the purpose of determining the mass percent composition of an aqueous hydrogen peroxide solution?

The mass percent composition of an aqueous hydrogen peroxide solution tells us the percentage of hydrogen peroxide present in the solution by mass. This information is important for various applications such as in the production of bleaching agents and as a disinfectant in various industries.

2. How is the mass percent composition of an aqueous hydrogen peroxide solution calculated?

The mass percent composition of an aqueous hydrogen peroxide solution can be calculated by dividing the mass of hydrogen peroxide present in the solution by the total mass of the solution and multiplying by 100%. This gives us the percentage of hydrogen peroxide present in the solution by mass.

3. What equipment is needed to determine the mass percent composition of an aqueous hydrogen peroxide solution?

To determine the mass percent composition of an aqueous hydrogen peroxide solution, you will need a balance to measure the mass of the solution, a volumetric flask to prepare a known volume of the solution, and a titration setup with a burette, pipette, and indicator to determine the concentration of hydrogen peroxide in the solution.

4. What is the significance of knowing the mass percent composition of an aqueous hydrogen peroxide solution?

Knowing the mass percent composition of an aqueous hydrogen peroxide solution is important for several reasons. It helps in determining the strength and concentration of the solution, which is crucial for its proper use in various applications. It also allows for the accurate preparation of solutions for specific processes, ensuring consistent results.

5. Can the mass percent composition of an aqueous hydrogen peroxide solution change over time?

Yes, the mass percent composition of an aqueous hydrogen peroxide solution can change over time. Hydrogen peroxide can decompose into water and oxygen when exposed to light, heat, or certain catalysts. This can lead to a decrease in the concentration of hydrogen peroxide and therefore, a change in the mass percent composition of the solution.

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