DRAFT: This module has unpublished changes.

Procedure


1. Obtained a 400mL beaker, stirring rod, and rubber policeman and made sure that they were clean

2. Measured 0.6130g of an unknown sample.

3. Measured the mass of the sample then the empty beaker without the sample and finally the mass of the beaker with the sample.

4. Added 5mL of distilled water into the beaker with the sample and stirred gently being careful not to spill anything.

5. Added 5Ml of 6M HCl to the solution and then poured distilled water into the beaker until there was about 250mL of solution within the beaker.

6. Covered the top of the beaker with the watch glass.

7. Placed the 400mL beaker with the solution on the hot plate.

8. Attached the burette clamp to the ring stand of the temperature sensor.

9. Placed a thermometer on the clamps and turned on the temperature sensor.

10. Watched the solution until the temperature reached 90*C.

11. Obtained 30 mL of BaNO3 and added it to the solution using the pipet.

12. Kept the temperature at a constant 90*C and let the precipitate settle.

13. After the precipitate had settled we let it cool and covered it with the watch glass then stored it.

14. In the following lab we retrieved the sample and began placed it on the hot plate.

15. Turned on the hot plate and let the sample heat at 90*C for about an hour.

16. We were careful to not heat the sample too fast.

17. After heating the sample we let it cool to room temperature.

18. Folded a piece of filter paper into a cone shape to filter out the sample.

19. Placed the filter paper on the funnel and then placed the funnel over a 400ml beaker using the ring stand.

20. Wet the filter paper with the deionized water so that it will stick to the corners of the funnel.

21. Placed 100mL of water on the hot plate and began to heat it at 80*C.

22. Poured mixture with the precipitate through the funnel with the filter paper into another empty 400mL beaker.

23. After the water was close to boil we used it to thoroughly remove any precipitate that was left inside the beaker.

24. Obtained a crucible and recorded its mass.

25. Began heating the crucible for 5 minutes with a gentle flame then for 10 minutes on high flame.

26. After we let the crucible cool and recorded its mass again to ensure that it was within 10mg of the previous recorded mass.

27. Folded the filter paper into a small square that would fit inside the crucible, being careful not to loose any precipitate.

28. After placing the filter paper inside the crucible we recorded its mass and began to heat the crucible.

29. The crucible had to heat until the filter paper turned to ash.

30. After we let the crucible cool and recorded its mass.

31. We had to repeat the heating process until we obtained two readings that were within 10mg of each other

DRAFT: This module has unpublished changes.