• So, 3% of H2O2 means there are 30 g H2O2 in 1000 g of solution, that is in 1 liter of solution. Now, divide 30 g/L by the molar mass of H2O2, which is 34 g/mol, as easily obtainable from the molecular formula.


  • The molarity is obtained as moles of solute in 1 L (1000 mL) of solution. In your case, 1 L of solution contains 300 g of H2O2 (PM=34.01 g/mol). Therefore, the molarity is (300 g/34.01 g/mol) = 8.82 M.

    Similarly, what is the molarity of 100 ml of a 3.0 h2o2 solution? The 3% mass/volume H2O2 means 3 g of H2O2 in 100 ml of water. Molarity = 0.066 mol / 0.100 L = 0.66 M.

    In this regard, what is a 3 solution of hydrogen peroxide?

    To make a gallon of 3% peroxide: In a clean gallon container, combine 1 and ¼ cups of 35% food grade hydrogen peroxide with 14 and ¾ cups of water. To make 3% hydrogen peroxide from 35% hydrogen peroxide, the general mixing guideline is: 1 part 35% hydrogen peroxide plus 11 parts water = 3% hydrogen peroxide.

    How do you find the concentration of hydrogen peroxide?

    The classical methods for measuring hydrogen peroxide concentration are :

    1. Direct measurement of the absorbance at 240nm of the H2O2 molecule.
    2. Through reaction of the peroxide with ferrous iron, monitored via a subsequent reaction with the dye xylenol orange and measurement of the absorbance of the solution at 550nm.
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