A solution of potassium permanganate (KMnO4) was standardised by titrating with 0.1908 g of Na2C2O4 dissolved in 50 cm3 of acidified water. The endpoint was reached after 24.50 cm3 of solution had been added. Calculate the molar concentration of KMnO4 in the solution.

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To calculate the molar concentration of KMnO4 in the solution, we need to use the information given in the problem.

Step 1: Find the molar mass of Na2C2O4
The molar mass of Na2C2O4 can be calculated by adding the atomic masses of its constituent elements:
Sodium (Na) has a molar mass of 22.99 g/mol.
Carbon (C) has a molar mass of 12.01 g/mol.
Oxygen (O) has a molar mass of 16.00 g/mol.

So, the molar mass of Na2C2O4 is:
(2 * 22.99) + (2 * 12.01) + (4 * 16.00) = 134.07 g/mol

Step 2: Calculate the number of moles of Na2C2O4
Using the molar mass and the given mass of Na2C2O4, we can determine the number of moles using the equation:
moles = mass / molar mass

moles = 0.1908 g / 134.07 g/mol

Step 3: Calculate the molar ratio between Na2C2O4 and KMnO4
From the balanced chemical equation, we know that the ratio between Na2C2O4 and KMnO4 is 5:2.
This means that for every 5 moles of Na2C2O4, we have 2 moles of KMnO4.

Step 4: Convert the volume of KMnO4 solution to moles
Given that 24.50 cm3 of KMnO4 solution was added, we need to convert this volume to moles.

First, we convert cm3 to liters by dividing by 1000:
volume (L) = 24.50 cm3 / 1000 = 0.0245 L

Step 5: Calculate the molarity of KMnO4
Finally, we can calculate the molarity of KMnO4 using the equation:
molarity = moles / volume (L)

molarity = (2/5) * (moles of Na2C2O4) / volume (L)

Now, you can substitute the values calculated in the previous steps to find the molar concentration of KMnO4 in the solution.