Question

For parts of the free-response that require calculations, clearly show the method used and the steps involved in arriving at your answer. You MUST show your work and consider significant figures to receive credit for your answer. Examples and equations may be included in your answer where appropriate.

6H+ + 2MnO₄ - + 5H₂C₂O₄ → 10CO₂ + 8H₂O + 2Mn₂ +
A student dissolved a 0.139g sample of oxalic acid, H₂C₂O₄, in water in an Erlenmeyer flask. Then the student titrated the H₂C₂O4, solution in the flask with a solution of KMnO₄ which has a dark purple color. The balanced chemical reaction that occurred during the titration is shown above.
b. The student used a 50.0mL buret to add the KMnO4 to the H₂C₂O4 until a faint lavender color was observed in the flask, an indication that the endpoint of the titration had been reached. The initial and final volume readings of the solution in the buret are shown below. Write down the initial reading and the final reading and use them to determine the volume of KMnO₄ that was added touring the titration.

Answer 1

The volume of KMnO₄ added during the titration is 23.24 mL.

Step-by-step explanation:

To determine the volume of KMnO₄ added during the titration, we need to subtract the initial volume reading from the final volume reading of the buret. The initial reading of the solution in the buret is 0.00 mL, and the final reading is 23.24 mL. So, the volume of KMnO₄ added during the titration is 23.24 mL - 0.00 mL = 23.24 mL.