Solutions and Pollution Investigation 1

Purpose: To investigate what happens when water is added to different solids.

Procedure:

Day 1

1) Make qualitative observations of solids A, B, and C using the magnifier. Record your observations in the data table below.

2) Predict what you think you will observe in each cup after adding water. Record your prediction in the data table.

Day 2

1) Add 2 full droppers of water to large Cup A, 2 full droppers of water to large Cup B, and 2 full droppers of water to the beaker.

4.Add 2 scoops of ci~ 2) Add 2 scoops of solid A to large Cup A, 2 scoops of solid B to large Cup B, and 2 scoops of solid C to the beaker.

3) Stir the mixture in Cup A for 30 seconds. Rinse the stir stick, and then stir the mixture in Cup B for 30 seconds. Rinse the stir stick, and then stir the mixture in the beaker for 30 seconds.

4) Record the appearance of the mixtures in the data table.

OVER

5) Place your filter funnel apparatus over Cups C and D in your SEPUP tray.

6) Fold your filter papers (see the figure below), moisten them, and put the folded filter paper in the filter funnels over Cups C and D.

7) Use the dropper and scoop to transfer as much of the mixture as you can from Cup A to the filer above Cup C.

8) Rinse the dropper and scoop and then use them to transfer as much of the mixture as you can from Cup B to the filter above Cup D.

9) After all the material that will pass through the filter has, remove the filter paper from the filter apparatus, unfold the filter paper, and place the filter paper on the table above the appropriate Cup.

10) Rinse the dropper and scoop, move the filter funnel apparatus over Cup E, place a new filter in the filter funnel. Transfer as much of the mixture from the beaker to the filter above Cup E.

11) Observe the filter paper, the material trapped by the filter paper, and the liquid that drips through the filter. Complete the data table.

Data Table
Solid A / Solid B / Solid C
Description of Solid
(Step #1) / Color
Particle Size
Description
“looks like . . .”
I predict the liquid will look like . . . .
(Step #2)
Description of Mixture
(Step #6) / Color
Description
“looks like . . .”
Description of Filter Paper
(Step #13) / Color
Particle Size
Description
“looks like . . . “


ANALYSIS QUESTIONS

1. List three controlled variables in this experiment.

2. Describe the major differences between the solids A, B, and C.

3. Explain the reason(s) for any differences between the liquid part of the mixtures in Cup A and Cup B and the beaker.

4. Describe any differences between the liquid in Cup C, the liquid in Cup D, and the liquid in Cup E. Try to explain the reason(s) for these differences.

5. If you could have collected all the solids that were left in Cup A after you stirred the mixture, do you think you would have a full scoopful? Explain why or why not.

6. If you could have collected all the solids that were left in Cup B after you stirred the mixture, do you think you would have a full scoopful? Explain why or why not.

7. If you could have collected all the solids that were left in the beaker after you stirred the mixture, do you think you would have a full scoopful? Explain why or why not.