A solution of hydrogen peroxide, H2O2 , is titrated with potassium permanganate, KMnO4 , according to the following equation:

5 H2O2 + 2 KMnO4+ 3H2SO4 -> 5O2 + 2 MnSO4 +8H2O + K2SO4

It requires 46.9mL of 0.145 mol/L KMnO4 to titrate 50.0 mL of the solution of H2O2 .

What is the moles per litre concentration of H2O2 in the solution?

.34 M

Determine mols KMnO4.

mols KMnO4 = M x L = ??

Convert mols KMnO4 to mols H2O2 using the coefficients in the equation.
mols H2O2 = mols KMnO4 x (5 mol H2O2/2 mol KMnO4) = ??

Convert mols H2O2 to mols/L.
M = mols/L
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To find the moles per litre concentration of H2O2 in the solution, we need to first determine the number of moles of KMnO4 used in the titration.

The given volume of KMnO4 solution used is 46.9 mL (milliliters) and the concentration is 0.145 mol/L (moles per liter). We can calculate the number of moles of KMnO4 using the formula:

moles of KMnO4 = volume (in liters) x concentration

Converting the given volume from mL to L:

46.9 mL = 46.9 / 1000 L = 0.0469 L

Now, we can calculate the moles of KMnO4:

moles of KMnO4 = 0.0469 L x 0.145 mol/L = 0.0068005 mol

According to the balanced chemical equation, the KMnO4 and H2O2 react in a 2:5 molar ratio. Therefore, the moles of H2O2 present in the solution is:

moles of H2O2 = (moles of KMnO4) x (5/2)

moles of H2O2 = 0.0068005 mol x (5/2) = 0.01700125 mol

Finally, to find the moles per litre concentration of H2O2, we divide the moles of H2O2 by the volume of the solution in liters:

moles per litre concentration of H2O2 = moles of H2O2 / volume (in liters)

volume of the H2O2 solution = 50.0 mL = 50.0 / 1000 L = 0.0500 L

moles per litre concentration of H2O2 = 0.01700125 mol / 0.0500 L = 0.3400 mol/L

Therefore, the moles per litre concentration of H2O2 in the solution is 0.3400 mol/L.

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