I need Help answering these charts in the files I…

I need Help answering these charts in the files I…

Experiment: Separation of a Mixture
A large amount of aspirin will dissolve in hot water, but very little (or none at all) will
dissolve in cold water. The other ingredients in a safety-coated aspirin pill are soluble in both
hot and cold water. We can use this solubility difference to separate the aspirin in a pill from
the other ingredients. You will allow a hot solution containing a crushed pill to cool in an ice
bath, where the aspirin crystals should begin to form. If the cooled solution is filtered through
a new piece of filter paper, almost all of the solid aspirin will be caught by the filter and the
impurities that are soluble in cold water will remain in the water.

Materials
Safety Equipment: Safety goggles, gloves
Aspirin pills (safety-coated, low dose)
Test tube holder
Filter paper
Plastic bag
10 mL graduated cylinder
Scale
Distilled water*
Bowl*

Test tube rack
3 Test tubes
Funnel
Mortar and pestle
Stir rod
Wash bottle
Watch glass
Boiling water*
Ice*
* You must provide

Procedure
1. Prepare a boiling water bath. HINT: This may be done over the stove. CAUTION:
Always use a heat pad or gloves when handling hot materials.
2. Pre-weigh a sheet of filter paper and a watch glass. Record each mass in the Data
section.
3. Prepare an ice water bath by filling a large bowl with a mixture of ice and tap water.
Fill the wash bottle with distilled water and place it in the bath.
4. Mark three test tubes as A and B and C. Place Test tubes A and B into the test tube
rack.

Figure 3: Filtering funnel preparation diagram
5. Prepare a filtering funnel as shown in Figure 3: fold a piece of filter paper in half twice
to make quarters, and place the paper in the funnel so that three quarters are open on
one side and one quarter is on the opposite side. Seat the filter paper into the funnel by
moistening the paper with a small amount of water.
6. Insert the funnel with filter paper into test tube A supported in the rack. Discard any
water that filters into this test tube.
7. Place four safety-coated, low-dose (81 mg) aspirin pills into the mortar. Gently crush
the pills with the pestle into a fine powder.
8. Pour all of the ground aspirin powder into test tube C. HINT: Pour the powder onto a
piece of paper, then shape the paper to more easily funnel the powder into the tube.
9. Add 10 mL water to the powder in the test tube and stir with a stirring rod.
CAUTION: The test tube bottom is easily broken if too much force is applied with
a stirring rod.
10.Use a test tube holder to place test tube C (with the aspirin powder) into the boiling
water bath. Keep the test tube in the bath for 5 minutes. Stir the solution in the test tube
frequently while it is heated. Record your observations in Table 1. Leave the test tube
in the bath until the next step. CAUTION: This solution will be extremely hot.
Always use a test tube holder to handle the heated test tube. Do not touch it
directly with your hands.
11.Use a test tube holder to remove test tube C from the boiling water. Pour half the hot
contents in the filtering funnel above test tube A, then immediately place test tube C
back into the boiling water. Allow all the liquid to completely filter into the test tube.
12.Pour the rest of the hot contents into the funnel, and allow the solution to completely
filter into test tube A. HINT: If filtering the first half of the solution went very slowly,
it will help if you replace the filter paper for this new solution.
13.Allow the hot, filtered solution in test tube A to cool until it is no longer warm.
Remove the filter paper and clean the funnel for later use.
14.Place test tube A with the cooled, filtered liquid into the ice water bath. Continue to

cool the solution until generous amounts of crystals form. This should take about 5
minutes. If crystals do not form, try scratching the sides of the test tube with a glass
stirring rod until the crystals begin to form. Record your observations in Table 1.
15.Prepare another folded filter paper (pre-weighed) inside the cleaned funnel as you did
in Step 5. Insert the cleaned filtering funnel into test tube B in the rack. Discard any
water that filters into this test tube.
16.Transfer the crystals from cooled test tube A into the filtering funnel above test tube B.
Use small amounts of ice-cold distilled water from the wash bottle to rinse the crystals.
DO NOT USE MORE THAN A SMALL AMOUNT OF ICE COLD WATER TO
TRANSFER AND RINSE THE CRYSTALS OR TOO MANY WILL
DISSOLVE.
17.Carefully remove the filter paper containing the crystals and place it on the watch
glass, then set aside to dry. DO NOT THROW THE CRYSTALS AWAY. Allow the
crystals to dry overnight or until the crystals are completely dry.
18.Clean up by washing any dirty glassware. Be sure that you do not throw away the
crystals drying on the filter paper!
19.After the crystals are completely dry, weigh them on the scale (crystals plus filter
paper and watch glass). Record the mass in the Data section, along with your
observations in Table 1.DO NOT THROW THE CRYSTALS AWAY. THEY
WILL BE USED FOR A LATER LAB.
Data and Calculations
1.
2.
3.
4.
5.

Pre-weighed filter paper mass:
_________________
Pre-weighed watch glass mass:
_________________
Filter paper, watch glass, and aspirin mass:
_________________
Mass of aspirin obtained:
_________________
Calculate the percent of recovery using the formula below:
Actual amount (g aspirin obtained)
-----------------------------------------------------X 100% = ______________ %
Theoretical yield (0.081 g/pill X # pills
used)
Table 1: Observations for aspirin experiment
Procedure Number
10. Crushed aspirin and water
mixture in hot water bath
14. Aspirin mixture in ice water
bath
19. Aspirin crystals

Observations

Click here to download and fill-in the table(s)/graph(s) for this experiment.

© 2010 eScience
Labs, Inc.
All Rights Reserved

Data and Calculations
1. Pre-weighed filter paper mass:?????

2. Pre-weighed watch glass mass:

3. Filter paper, watch glass, and aspirin mass:

4. Mass of aspirin obtained:

5. Calculate the percent of recovery using the formula below:

Actual amount (g aspirin obtained)
× 100%=????? %
Theoretical yield (0.081 g/ pill ? # pills used)

Ta bl e 1 : Observations for aspirin experiment

Procedure Number
10. Crushed aspirin and water mixture in hot water bath

Observations
14. Aspirin mixture in ice water bath
19. Aspirin crystals
© 2010 eScience Labs, Inc.
All Rights Reserved