manu9

You have all the information you need to prepare your solution (assuming 22.05 M is the correct concentration of your H2O2). However, you did not provide us with the volume of this stuff that you need to make. Let's assume you want to make 100 mL of a 1M solution of H2O2. Using the general dilution equation M1V1=M2V2 you will have : (22.05 M)(v) = (100 mL)(1.00M) Solving for "v", you'll get the volume you need to pipet from the big bottle of H2O2, which comes out to be about 4.6 mL. So, using a pipet, transfer 4.6 mL of H2O2 into a 100 mL volumetric flask. Fill the flask to the "mark" using the phosphate buffer. I hope this helps! E_Sik