Describe how one would make a 100 mL solution of 0.1 M H2O2

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In summary, to make a 100 mL solution of 0.1 M H2O2, you would need 0.34 g of hydrogen peroxide. However, it is important to note that the specific form or concentration of the hydrogen peroxide may vary and affect the final mass needed. It is necessary to have this information in order to accurately make the solution.
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axer
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Homework Statement


Describe how one would make a 100 mL solution of 0.1 M H2O2?

Homework Equations

The Attempt at a Solution


to get no. of moles = ml*M/1000
100*0.1/1000= 0.01 moles h202.

mass= 0.01*34= 0.34 g.

Correct?
 
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  • #2
That's a correct mass of hydrogen peroxide, but that's not a recipe.

To be honest I don't see how to answer the question without knowing what you can use to prepare the solution. Commercially hydrogen peroxide is sold in may different form (solutions of different concentrations), not knowing which one will be used it is impossible to give an answer.
 
  • #3
Borek said:
That's a correct mass of hydrogen peroxide, but that's not a recipe.

To be honest I don't see how to answer the question without knowing what you can use to prepare the solution. Commercially hydrogen peroxide is sold in may different form (solutions of different concentrations), not knowing which one will be used it is impossible to give an answer.
Thank you, My teacher gave us the recipe. i just wanted to check the mass number.
 

1. How do you calculate the amount of solute needed to make a 100 mL solution of 0.1 M H2O2?

The amount of solute needed can be calculated using the formula: amount of solute (in moles) = molarity x volume (in liters). In this case, the molarity is 0.1 M and the volume is 100 mL (0.1 L), so the amount of solute needed would be 0.01 moles of H2O2.

2. How would one accurately measure out 100 mL of solution?

To accurately measure out 100 mL of solution, you can use a graduated cylinder or a volumetric flask. These instruments are designed to measure volumes with high precision. Make sure to read the volume from the bottom of the meniscus for accurate measurement.

3. What is the procedure for making a 0.1 M H2O2 solution?

1. Calculate the amount of solute needed using the formula mentioned in the first question.
2. Measure out the required amount of H2O2 using a graduated cylinder or volumetric flask.
3. Transfer the H2O2 to a 100 mL volumetric flask.
4. Add distilled water to the volumetric flask until the total volume reaches 100 mL.
5. Close the flask with a stopper and invert it several times to ensure proper mixing.
6. Your 0.1 M H2O2 solution is now ready to use.

4. Can any other solvent be used instead of distilled water?

Yes, other solvents can be used to make a 0.1 M H2O2 solution. However, it is important to choose a solvent that is miscible with water and does not react with H2O2. Some examples of suitable solvents are ethanol, acetone, and ethyl acetate.

5. How should the 0.1 M H2O2 solution be stored?

The 0.1 M H2O2 solution should be stored in a tightly sealed container in a cool and dark place. It is also important to label the container with the date of preparation and the concentration of the solution. H2O2 solutions are unstable and can decompose over time, so it is best to prepare fresh solutions as needed.

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