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An experiment designed to investigate how different types of water (room temperature, acidic, and saltwater) affect the dissolution rate of alka-seltzer tablets. Students are asked to hypothesize which type of water will cause the tablet to dissolve fastest and slowest, and then conduct the experiment to test their hypothesis. The learning target, materials list, procedure, and expected outcomes.
What you will learn
Typology: Lecture notes
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Scientific Process
Edgenuity Unit: Scientific Knowledge Lesson: Analyzing Data/Drawing Conclusions Time: 30-60 minutes
Learning Target
I can make predictions based on prior knowledge, test them using an experiment, and analyze my results.
Materials
3 Alka-Seltzer tablets 3 plastic cups (18 oz.) Salt Teaspoon
Vinegar Water Stopwatch or clock with second hand
The fizzing you see when you drop an Alka-Seltzer tablet in water is the same sort of fizzing that you see from baking powder. A baking powder reaction is caused by an acid reacting with baking soda (sodium bicarbonate). If you look at the ingredients for Alka-Seltzer, you will find that it contains citric acid and sodium bicarbonate (baking soda). When you drop the tablet in water, the acid and the baking soda react -- this produces the fizz.
The question for this investigation will be: “What factors will make an Alka-Seltzer tablet dissolve faster?” You will compare 3 factors: Room temperature water Acidic water Salt water
The control group is the group that is separated from the rest of the investigation; the factors will not influence this group. What should be your control group?
The independent variable is the factor that changes between groups, for this investigation the independent variable will be the type of water (acidic, salt, etc).
The dependent variable is what changes or is different because of the independent variable. Based on the original question, what will you observe as the dependent variable?
Develop your hypothesis by completing this statement:
Alka-Seltzer will dissolve fastest in ____________ water, and slowest in ____________water.
I think this because ___________________________________________________________.
