Question

you will be given a sample containing an unknown amount of sodium oxalate (NA₂C₂0₄). you will be expected to tell us the percentage of (NA₂C₂0₄). very accurately by doing a titration with the strong oxidizing agent kmno4.

Answer 1

To determine the percentage of Na₂C₂O₄ in the sample, calculate the moles of KMnO4 used in the titration and then use stoichiometry to find the moles of Na₂C₂O₄. Finally, calculate the percentage by dividing the mass of Na₂C₂O₄ by the mass of the sample and multiplying by 100.

Step-by-step explanation:

To determine the percentage of Na₂C₂O₄ in the sample, we need to calculate the moles of KMnO4 used in the titration and then use stoichiometry to find the moles of Na₂C₂O₄. Finally, we can calculate the percentage by dividing the mass of Na₂C₂O₄ by the mass of the sample and multiplying by 100.

1. Calculate the moles of KMnO4: moles of KMnO4 = (volume of KMnO4 solution) x (molarity of KMnO4 solution)
2. Use stoichiometry to find the moles of Na₂C₂O₄: moles of Na₂C₂O₄ = 2 x (moles of KMnO4)
3. Calculate the mass of Na₂C₂O₄: mass of Na₂C₂O₄ = moles of Na₂C₂O₄ x (molar mass of Na₂C₂O₄)
4. Calculate the percentage of Na₂C₂O₄: %w/w Na₂C₂O₄ = (mass of Na₂C₂O₄ / mass of the sample) x 100