The hydrogen peroxide solution that you are using in this experiment is labeled

Question

The hydrogen peroxide solution that you are using in this experiment is labeled as a 3% solution, mass/volume. However, in order to complete the calculations, the concentration must be in molarity Calculate the molarity of a 3% mass/volume H2o, solution (Part I, II, IV, and V) and a l 5% mass/volume H02 solution (Part completed in your lab notebook as part of the pre-lab assignment for this experiment. You may want to read through "(D) Samp III) and record these values in the table below. This table should be le Exercise" in the following introduction of this experiment to refresh your onhow to correctly calculate the conversion roon a maass/volume %solutionto a molarity memo solution [KI] before mixing 0.50 M 0.25 M 0.50 M 0.50 M [H2O2] before mixing Volume KT (mL) Volume HO Exp (mL) 4 4 IV 4 0.50 MM Show the calculations used in determining the concentration of the 3% hydrogen peroxide solution in molarity, [HO], in the carbonless notebook as part of your pre-lab assignment.

Explanation / Answer

Molarity of 3% (m/v) H2O2 solution

3 g H2O2 in 100 ml water

moles of H2O2 = 3 g/34 g/mol

                         = 0.088 mol

molarity = moles/L of solution

So,

molarity of 3% H2O2 solution = 0.088 mol/0.1 L

                                                = 0.88 M

Molarity of 1.5% (m/v) H2O2 solution

1.5 g H2O2 in 100 ml water

moles of H2O2 = 1.5 g/34 g/mol

                         = 0.044 mol

molarity = moles/L of solution

So,

molarity of 3% H2O2 solution = 0.044 mol/0.1 L

                                                = 0.44 M

        

  

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