In your trials, did the hot or cold water finish first? If they walk, there is less chance that they will bump into another student, but if all the students are running into the room it is very likely there will be some collisions between students. Think about a class of students entering a room. When temperature is increased, molecules move faster, so it is likely there will be more collisions in the same amount of time. Temperature also affects the rate of a reaction. In your trials, when was the surface area the largest? Did the rate go faster? More dissolved particles leads to more collisions and a faster reaction. When these dissolved particles collide, the chemical reaction happens. When surface area is increased, the citric acid and sodium bicarbonate dissolve better and faster in water. The sodium bicarbonate must collide with the acid to make the carbon dioxide gas. The carbon dioxide forms when two key ingredients in these tablets, citric acid and baking soda (sodium bicarbonate), dissolve in water and then randomly collide into each other in just the right way. The speed of a reaction depends on the number of collisions between molecules. If the reaction is going faster, then it will take less time to finish and will fizz more vigorously. When you added the tablet to the vinegar or water, you heard fizzing and saw bubbling.
From your observations in Part 1, what change to the surface area made the reaction go faster?.Write the time the bubbling ends in each cup in the chart.ĭescribe what you heard and saw.
Compare the amount of bubbling in each cup.As you start the stopwatch, place one whole Alka-Seltzer tablet into each of the three cups of water.Use an oven mitt or potholder when handling the hot tap water. Add 125 mL (approximately ½ cup) of hot tap water to the first clean clear cup, 125 mL of room temperature water to the second clean cup, and 125 mL of cold water in the third clean cup.How does temperature affect how fast or slow the reaction will occur? As you start the stopwatch, slide the powdered Alka-Seltzer down the crease of the paper into the third cup of vinegar.Use the bottom of the measuring cup to press and crush the tablet into a fine powder. Using the same piece of folded paper, place an Alka-Seltzer tablet inside the pages near the crease.As you start the stopwatch, slide the Alka-Seltzer tablet pieces down the crease of the paper into the second cup of vinegar.Use the bottom of the measuring cup to press on the tablet and break it into about 6-8 pieces. Place an Alka-Seltzer tablet between the pages of a piece of folded paper near the crease.Stop the time when the bubbling ends and record this time in the chart.As you start the stopwatch, drop one Alka-Seltzer tablet in the first cup of vinegar.How does the tablet surface area affect how fast or slow the reaction will occur? Fold one piece of scrap, wax, or parchment paper in half.Unwrap 3 packets of Alka-Seltzer tablets so that there are 6 tablets.Vinegar simulates the excess acid in the stomach. Pour 125 mL (about ½ cup) of vinegar into each of 3 clear cups or bags.1 piece of scrap paper (wax or parchment paper works too).Stopwatch or stopwatch app that can measure seconds.6 clear plastic or glass cups or Ziplock bags.We can monitor the formation of carbon dioxide by hearing the fizz and seeing how long it is produced. Let’s see how you can make the fizzing reaction of Alka-Seltzer tablets go faster or slower.
You may even be able to hear the bubbles as they pop. As the carbon dioxide is produced, you can see bubbles grow and float to the surface of the water.
Alka-Seltzer and other fizzing tablets produce carbon dioxide-filled bubbles when placed in water. Introduction of activityĪlka-Seltzer is a common antacid used to relieve an upset stomach. Solid waste can be disposed of in the trash. Do not eat or drink any of the materials used in this activity.ĭisposal: All liquids and solutions can be poured down the drain with running water.Thoroughly wash hands after conducting the activity.Clean up and dispose of materials properly when you are finished with the activity.Do not eat or drink food when conducting this activity.Tie back long hair and secure loose clothing, such as long sleeves and drawstrings.Wear appropriate personal protective equipment (safety glasses, at a minimum), including during preparation and clean up.Read all directions and safety recommendations before starting the activity.Ask an adult for permission to do the activity and for help when necessary.
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