Here is a link for doc where I got the assignment:

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Procedure

1. Weigh out between 2 - 3 g of the unknown mixture, using a spatula, in a 100 or 150 mL beaker and record the mass, include all numbers from the balance on your data sheet.

Extraction

2. Measure 50 mL of distilled water into a graduated cylinder, then add the water to the solid in the beaker. Stir the mixture with a stirring rod or spatula for 2 minutes.

Filtration

3. Place a long-stem funnel in an iron ring attached to a ring stand as seen in Figure 1.

4. Obtain a piece of filter paper from your instructor, place it on a dry watch glass. Weigh the watch glass and paper together and record the mass. Make sure the balance says 0.000 g before you use the balance.

5. Fold the filter paper according to the illustration in Figure 2. First fold it in half, then in half again. Open up the filter paper so it makes a cone, place it into the funnel.

6. Take a new, dry 100 or 150 mL beaker and weigh it on the balance. This is nowbeaker #2. Record its mass on your data sheet.

7. Place beaker #2 underneath the funnel so that the stem is clearly inside the beaker and touching the side of it.

8. Wet the filter paper inside the funnel with distilled water and make sure it sticks to the side of the funnel.

9. Pour the mixture from the beaker through the funnel taking care not to spill or splash any out of the funnel. When there is about 10 mL remaining in the beaker, and you are certain you will not overflow the funnel, swirl the mixture to suspend as much solid in the liquid as possible, then quickly pour the remaining mixture from the beaker. The should get most of the solid into the funnel.

10. For the solid remaining in the beaker, angle the beaker so that it points downwards intothe funnel and spray the sides of the beaker with a distilled water spray bottle to wash there rmaining solid into the funnel. Be sure to get all of the solid into the funnel. You made need to scrape the sides with a spatula or rubber policeman to get all of the solid out.

11. Rinse the beaker and any utensils you have used into the funnel, as well as the funnel itself to ensure all material has been transferred to the funnel and beaker #2.3

Evaporation

12. Place beaker #2 which contains the filtrate on a hot plate set at 350 oC until it starts to boil,then lower the heat slightly to 300oC and allow to boil until a small amount of liquid remains. At this point there will be a small amount of boiling liquid and some white solid.

13. While you are waiting for your liquid to evaporate, carefully remove the filter paper containing the sand from the funnel and place it on the watch glass you weighed with the filter paper earlier.

14. Place the watch glass with the filter paper and the sand on it in the oven while you continue the remainder of the lab.

15. Lower the heat on the hot plate to about 150oC and continue heating until the solvent has fully evaporated. If you leave the temperature on the hot plate too high, it will cause the mixture to splatter and you will lose some of your solid.

16. Once the water has fully evaporated remove the beaker from the hotplate using beaker tongs by grabbing the beaker just under the lip at the top of the beaker, and set in on a piece of wire gauze to cool to room temperature. You can't weigh hot objects on the balance. It will give you an improper reading of the mass.

17. Carefully check your sand on the filter paper in the oven. If it is dry, pick it up with to ngsand place it on a piece of wire gauze to bring it back to your lab bench. Let it cool and then weigh it on the balance. If it is still wet leave it in the oven until dry and then follow the steps above.

Calculations

Mass of NaCl recovered (g) = mass beaker #2 with NaCl - mass beaker #2

Mass of sand recovered (g) = mass beaker #3 with sand - mass beaker #3

Percentage of NaCl in your unknown mixture (%) = mass NaCl / mass sample * 100

Percentage of sand in your unknown mixture (%) = mass sand / mass sample * 100

Total mass of sand and salt recovered (g) = mass NaCl + mass sand

Percent recovery of the components (%) = mass recovered / mass unknown mixture * 100

INSTRUCTIONS

Print out these instructions and the report sheet.

Read the Background/Introduction section of the lab manual and watch the video.

Do the calculations on the report sheet below and answer the supplementary questions. Save it as either a .doc or .pdf file and submit it as an attached file under the lab assignment. No labs will be accepted by e-mail.

Data Sheet

Data

Mass of sample, g 2.846 g

Mass of beaker #2, g 31.364 g

Mass of beaker #2 & NaCl (after evaporation), g 32.612 g

Mass of watch glass & filter paper, g 17.885 g

Mass of watch glass & filter paper & sand, g 19.281 g

Calculations (Show Calculations to receive credit)

Mass of NaCl recovered, g __________________________

Mass of sand recovered, g __________________________

% NaCl in your mixture __________________________

% sand in your mixture __________________________

Total mass of NaCl & sand recovered __________________________

% recovery of the components in the mixture __________________________

SUPPLEMENTARY QUESTIONS

A student completed the lab but found that the total amount of material recovered weighed more than the original sample. What is the most likely source of error?

A package of freshly picked sweet peas weighed 454 g. The peas were freeze dried and the recovered peas weighed 122 g. What was lost and what is the percentage of the compound lost?

IN 100 g of sweet peas, there are 14.5 g carbohydrates, 5.7 g sugar, 5.1 g fiber, 5.4 g protein and 0.4 g of fat. Calculate the percent composition for each of these compounds.