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1. Question: What effect does the water temperature have on solution rate?

Hypothesis: If the water is stirred, then the tablet will dissolve faster because stirring increases the dissolving rate.


2. Question: What effect does crushing the tablet have on solution rate?


Hypothesis: If the tablet is placed in warm water, then the tablet will dissolve faster because an increase in temperature speeds up the dissolving rate of some substances.


3. Question: What effect does adding soda to the water have on solution rate?


Hypothesis: If soda is added to the water and tablet, then the dissolving rate will be longer because more substances were mixed to the solution/mixture.


Experimental Design


Select one of the questions from Part 1 above to test the effect of one variable on the solution rate of Alka-Seltzer®. Apply the steps of the Scientific Method to test the validity of your hypothesis. Once the plan is complete, follow the steps to conduct the experiment.

Question: Copy the question that you have selected from page above.


• What effect does the water temperature have on solution rate?


• Hypothesis: Copy the hypothesis (remember to use the proper format - "If..., then... because..."): 

If the water is stirred, then the tablet will dissolve faster because stirring increases the dissolving rate.


Experiment: Plan your experiment by following the steps below. 


What is the independent variable (manipulated variable) that you are testing? Water Temperature (hot, cold, room temperature)


What is the dependent variable (responding variable)? Solution rate (dissolving rate)


What variables must be kept constant for this to be considered a "controlled experiment? Water & Temperature


List the materials you will need to perform this experiment. 

____________________________________________________________________________________________________________________________________________________________

____________________________________________________________________________________________________________________________________________________________


Outline the procedure you will follow as you conduct this experiment. Be specific. Include a control group and allow for adequate time to repeat the experiment to verify your results.


1.____________________________________________________________________________


2.____________________________________________________________________________


3.___________________________________________________________________________


4.____________________________________________________________________________


5.____________________________________________________________________________


6.___________________________________________________________________________


Make a data table to show your results.

Answer & Explanation
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