Because it contains oil, you should have an adult help you devise a safe way to warm or cool the contents of each container. How does the bicarbonate reaction look in the homemade lava lamp? Observations and results Did the Alka-Seltzer tablet dissolve much faster in the hot water compared to the cold? Were there a lot more bubbles produced initially in the hot compared with the cold water?
After the Alka-Seltzer tablet was added to the hot water the tablet should have quickly dissolved, taking some 20 to 30 seconds to do so, depending on the exact temperature. After the tablet was added to the ice-cold water it should have taken much longer to dissolve, with most of the tablet disappearing after about two to three minutes, but with some bubbles still apparent after six minutes or longer. In the hot water the tablet should have more vigorously produced bubbles than in the cold water.
The higher the temperature, the faster the molecules move—and the more likely it is that the bicarbonate will contact hydrogen in just the right way for the chemical reaction to occur and produce carbon dioxide bubbles.
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Go Paperless with Digital. Key concepts Chemical reactions Molecules Carbonation Temperature Introduction Have you ever wondered why bubbles form when an Alka-Seltzer tablet is dropped into water?
Build a Cooler. Get smart. Sign up for our email newsletter. Sign Up. Mobile Newsletter chat close. Mobile Newsletter chat dots. Mobile Newsletter chat avatar. Mobile Newsletter chat subscribe. Science Questions. Why does Alka Seltzer fizz? This can be anything, but try to seek answers with specific regard to the variables being changed in this activity.
At the end, collect and present all class data on the board. Highlight discrepancies and the general trend. You must be logged in to post a comment. Skip to content. June 19, June 23, Sid M. Fill the beaker with water up to the mL mark with cold water and stir the ice water until the temperature equilibrates. Measure the temperature of the water and record it in the table. Add a tablet and record the time it takes for the tablet to react.
Repeat with room temperature water, then with hot water heated to 70 degrees C using a hot plate. The Effect of Surface Area on Rate of Reaction Prepare three different sizes of the Alka Seltzer tablets: A whole tablet A tablet broken into quarters A tablet ground into powder: Place the tablet it a piece of weighing paper wax or parchment paper work as well and break it either with your hands or crush it using the back of a metal spoon.
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