Question
Asked Mar 24, 2020
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In the second test, you will prepare 10 mL of each solution containing 0.1%, 0.2%, 0.5%, 0.8%, 1%, 5%, and 10% H2O2. Explain how this will be done using a 10% stock solution of H2O2 to prepare the 5 % solution and a stock solution of 1 % H2O2 to prepare the remaining

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Expert Answer

Step 1

Amount needed for the preparation of 5 mL, 10% stock solution of H2O2 from the 10% stock solution can be calculated as follows:

Chemistry homework question answer, step 1, image 1

Where C1 and V1 are the concentration and volume of initial solution and C2 and V2 are the concentration and volume of final solution.

Putting the values in equation (1)

Chemistry homework question answer, step 1, image 2

Thus 5 mL of 10% stock solution of H2O2 is needed to prepare 5% of 10 mL stock solution.

 

Step 2

Amount of  H2O2 needed for the preparation of 10 mL of 0.1% stock solution from 1% stock solution can be calculated as follows:

Chemistry homework question answer, step 2, image 1

Amount of  H2O2 needed for the preparation of 10 mL of 0.2% stock solution from 1% stock solution can be calculated as follows:

Chemistry homework question answer, step 2, image 2

Amount of  H2O2 needed for the preparation of 10 mL of 0.5% stock solution from 1% stock solution can be calculated as follows:

Chemistry homework question answer, step 2, image 3

 

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