REPORT SHEET: DECOMPOSITION OF HYDROGEN PEROXIDE DATA COLLECTION & POST-LAB QUES

Question

REPORT SHEET: DECOMPOSITION OF HYDROGEN PEROXIDE DATA COLLECTION & POST-LAB QUESTIONS write a balanced equation for the decomposition of hydrogen peroxide. The hydrogen peroxide that you are using in this experiment is labeled as a 3% masswolume. However, in order to complete the calculations, the concentration must be in molarity. Calculate the molarity of a 3% H202 solution (Part I, ll) and a 1.5% mass/volume solution (Part lll) and record these values in the table below. Calculations: Volume H202 [H202] before Volume K [Kij before Part (mL) mixing (M) mixing (M) (mL) 0.50 0.25 0.50

Explanation / Answer

Molarity of 3% H2O2 (m/v) solution

30 g H2O2 in 1000 ml water makes 3% H2O2 solution

moles of H2O2 = 30 g/34 g/mol = 0.88 mols

volume of solvent = 1000 ml = 1 L

So,

molarity = moles of solute/volume of solution in liters

molar concentration of H2O2 solution = 0.88 mols/1 L = 0.88 mols/L

Molarity of 1.5% H2O2 (m/v) solution

15 g H2O2 in 1000 ml water makes 1.5% H2O2 solution

moles of H2O2 = 15 g/34 g/mol = 0.44 mols

volume of solvent = 1000 ml = 1 L

So,

molar concentration of H2O2 solution = 0.44 mols/1 L = 0.44 mols/L

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