Part II Data Analysis

1. Calculate the molar concentration (mol/L) of each dilution of hydrochloric acid, HCl, and sodium hydroxide, NaOH. Record these values in the chart above. If your teacher so instructs, show how you completed your calculation for the concentration of hydrochloric acid in the second well or test tube.
   
2. Propose a convenient pattern to summarize your observations. (Hint: Think about the colors of the spectrum.)
   

Part III Procedure

1. Add 3-4 drops of each commercial liquid sample to a separate well or test tube. Label each location or draw a map so you can identify each sample.
   
2. For commercial solid samples, add an amount about the size of a pencil lead tip into a separate well or small test tube. Add 3-4 drops of water to each.
   
3. Add a drop of universal indicator to each well or test tube. Record your observations.
   
4. If your teacher so instructs, try any of the other tests you completed in Part I with additional samples of the commercial materials.
   
5. Thoroughly wash your hands before leaving the laboratory.
   

Part III Data Analysis

1. Classify each commercial sample as acidic, basic, or neutral.
   
2. Match the particular concentration of hydrochloric acid or sodium hydroxide from Part II that each commercial sample most closely resembles in its acidic or basic properties.
   

1. How important is it for consumers to understand some fundamental ideas about acids and bases?
   
2. Is the acidity or basicity of a commercial product usually related to how it is used? Explain.
   

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