![]() ![]() (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?ĭid 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?Īfter 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. You could repeat this activity using your homemade lava lamp at colder and warmer temperatures. Fill it with about two inches of water, add five drops of food coloring and then fill it at least three quarters full with vegetable oil before adding one quarter of an Alka-Seltzer tablet. Extra: You can turn this activity into a homemade lava lamp! To do this, you will use an empty container, such as a tall jar or clear plastic one- or two-liter bottle.If there is a greater surface area (that is, a tablet is broken up into more pieces to expose more surface), does the same amount of tablet result in the reaction happening faster or slower? Extra: Compare whole Alka-Seltzer tablets to pieces of Alka-Seltzer tablets.What temperature change is required to increase the reaction time by a factor of two (make it as twice as fast)? What about decreasing the reaction time by a factor of two? Extra: Test Alka-Seltzer tablets in a wider range of temperatures, and then draw a graph showing the time it takes a tablet to dissolve in water at each temperature (check with a thermometer).Why do you think you got the results you did?.Do you notice other differences in how the reaction happens in the colder versus in the hotter water?.How long does it take the tablet to disappear in the colder water? ![]() Again time how long it takes the tablet to disappear.
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