Consider a different titration for this exercise. Potassium permanganate (KMnO 4

Question

Consider a different titration for this exercise. Potassium permanganate (KMnO4) is the titrant and hydrogen peroxide (H2O2) the analyte according to the following balanced chemical equation.

concentration of MnO4? 0.550 M volume H2O2 solution 17.94 mL mass H2O2 solution 18.02 g volume of MnO4? solution 15.92 mL mmol of MnO4? mmol mmol of H2O2 mmol mass of H2O2 g mass % of H2O2 in the original sample % molarity of H2O2 in the original sample M Consider a different titration for this exercise. Potassium permanganate (KMnO4) is the titrant and hydrogen peroxide (H2O2) the analyte according to the following balanced chemical equation.

Explanation / Answer

2MnO4-(aq) + 5H2O2(aq) + 6H+(aq) <-------> 2Mn2+(aq) + 5O2(g) + 8H2O(l)

Now, millimoles of MnO4- = Molarity*volume of solution in ml = 0.55*15.92 = 8.756

Molar mass of H2O2 = 34 g/mole

Thus, millimoles of H2O2 = (5/2)*millimoles of MnO4- = 21.89

Mass of H2O2 = millimoles*molar mass/1000 = 0.744 g

mass% of H2O2 = (mass of H2O2/mass of solution)*100 = (0.744/18.02)*100 = 4.13 %

Molarity of H2O2 solution = moles of H2O2/Volume of solution in litres = 0.02189/0.01592 = 1.375 M

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