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Alka-Seltzer Surface Area

Decent Essays
Question: Does the amount of surface area affect how fast it takes for a rock” to be weathered?

Hypothesis: If we use 3 types of “rocks”, we think that the one that the smallest will be weathered away the fastest because it is the smallest in size than than the other “rocks”.

Materials:
2 Beakers
3 Alka-Seltzer Tablets
Room Temperature Water
Timing Device
Sheet of Paper
Pencil

Controlled Variables
Amount of Water
Temperature of Water
Volume of “Rock” (Alka-Seltzer)
Type of “Rock” (Alka-Seltzer)
Timing Device
Beakers

Manipulated Variable
Surface Area of the “Rock” (Alka-Seltzer)

Procedure
Fill one of the beakers with 200 mL of water.
Drop 1 whole tablet into the beaker and start the timer. Stop the timer when the entire tablet has dissolved. DO NOT
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Place the third tablet and place it on a sheet of paper. Take the unused beaker and crush the tablet to where it is a powder. Then, take a pencil and remove any powder on the bottom of the beaker. Take all the powder from the sheet of paper and pour all of the powder into the dry (unused) beaker.
Pour the 200 mL of water into the beaker with the tablet powder in it. Instantaneously, start the timer when you pour the water. Stop the timer when the powder has completely disappeared. DO NOT WAIT FOR THE BUBBLES TO STOP. ONCE THE TABLET IS GONE, TIME IS UP!
Record the data on the next page.

Whole, 4 Pieces, or Crushed
Time
Whole
49
4 Pieces
45
Crushed
43

Conclusion: The purpose of this lab was to see if surface area affects the rate of weathering. The data tells us that the surface area does, in fact, affect the rate of weathering. The more surface area (the crushed tablet), reduces the rate of weathering. In my hypothesis, I believed that the smaller the individual rocks, the faster the weathering rate would be. At the end of this experiment, I have learned that the more surface area means that the faster a rock will
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