Lab Report Procedures How Much Acetic Acid in Vinegar

Procedures

Lab Set up

1. The first step was setting up the equipment starting with the burette, and grabbing 3 50 mL flasks.

2. Next each empty flask was labeled, 1 2 and 3, and weighed.

3. The weight of flask 1 was 143.024 grams, flask 2 was 124.147 grams, and flask 3 was weighed out to 96.964 grams.

4. The next measurement taken was the weight of the oxalic acid on weighing papers scooped out with a spatula.

5. The oxalic acid weight of the first sample was 1.042 grams, the second sample weighed out to 1.070 grams, and the third sample weighed out to 1.065.

6. The oxalic acid was placed on the weighing papers before being weighed. Next roll the paper so it makes a cylinder shape with the acid in the middle.

7. With the paper rolled, the flask was tipped horizontally fitting the rolled paper as close to the bottom of the flask as possible.

8. Then the flask was quickly tipped upright to ensure that no excess oxalic acid was left on the sides.

9. The paper was removed from the flask.

10. Steps 6 through 9 were repeated for each sample of oxalic acid.

11. Next two drops of phenolphalein was placed into the flasks.

Sodium Hydroxide and Oxalic Acid Reaction

12. Next the sodium hydroxide was measured out to 50 mL in a 50 mL graduated cylinder.

13. The 50mL of sodium hydroxide was poured into the tube of the burette, making sure the lever is closed.

14. The tube was placed back into the clamps of the burette.

15. Then the initial volume of the sodium hydroxide was taken.

16. The flask of oxalic acid was placed under the tip of the burette.

17. On the first trial, it’s crucial to release the sodium hydroxide slowly. This was done to get an approximation of how much hydroxide is needed to create a reaction for the following trials.

18. The sodium hydroxide was released slowly. The sodium hydroxide created a light pink.

19. When the light pink color started to emerge, the burette...