University:
Hunter College CUNY
Course:
CHEM 106 | General Chemistry Laboratory
Academic year:

2022
Views:

100

Pages:

2
Author:

drolowpzco

Procedure/methods1. Obtain approximately 80 mL of the potassium permanganate solution in a 100 mL beaker. Label the beaker. 2. Set up a clean 50 mL buret in a buret clamp on a support stand. 3. Rinse the buret with approximately 10 mL of distilled water and then with two 5- mL portions of the potassium permanganate solution, MnO 4 - 4. Close the stopcock and fill the buret to just above the zero mark with the MnO solution 4 - 5. Open the stopcock to allow any air bubbles to escape from the buret tip. Close the stopcock when the liquid level is between 0 and 10 mL marks. 6. Record the precise label of the solution in the buret in an appropriate data table. This is the initial volume of the MnO solution. 4 - 7. Measure 1 mL of H O solution in a graduated cylinder and record the volume in an 2 2 appropriate data table. 8. Pour the H O solution into a clean 250 mL Erlenmeyer flask. 2 2 9. Measure 10 mL of the 3 M H SO solution into a clean 10mL graduated cylinder. Measure 2 4 10 mL of distilled or deionized water into a separate, clean 10 mL graduated cylinder. Add these to the Erlenmeyer flask and swirl to mix. 10. Position the flask under the buret so that the tip of the buret is within the flask but at least 2 cm above the liquid surface. 11. Titrate the H O with the MnO solution until the first trace of pink color persists for 30 2 2 4 - seconds. Remember to swirl the flask and rinse the walls of the flask with distilled water before the endpoint is reached. 12. Record the final buret reading as the final volume of the MnO solution in an appropriate 4 data table. 13. Repeat this again to preform 2 titrations. -