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“What is that liquid… Acid or Base

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					“Acid or Bases: What is that liquid?”
  What do you think an Acid is? What are some examples of Acids? Where have you heard of Acids before? What about Bases… what do you think a Base could be? What are some examples of Base? Where have you heard of Base before?

Unknown Liquids
In this lab you will see different examples of Acids and Bases. All the liquids in this lab are common household items you would find around your home like soft drinks, baking soda, and lemon juice. You will be testing the different liquids using cabbage juice as an indicator and making predictions of what you think the liquids are… acids or bases. 1. Carefully get all the appropriate supplies. Be careful and don’t spill anything! 2. Predict if each liquid is an Acid or Base. 3. Measure the indicator accurately and be careful to not spill any of the liquid. Drop a specific amount of the indicator (cabbage juice) in the liquid and observe the color change. 4. If it’s a Blue / Green color then it’s a BASE! 5. If it’s a Red / Pink color then it’s an ACID!

Substances
Vinegar Baking Soda Lemon Juice Soft Drink Soap Water Aspirin Ammonia Milk of Magnesia

Predictions

Color

Actual Results

Reflections
1. Based on your lab results, which substances are Acids? 2. Based on your lab results, which substances are Bases? 3. After you have seen some examples of acids and bases from the lab, what are some other examples of acids and bases you can think of? 4. Based on this lab, give your definition of an Acid (Think of the characteristics or properties of the acids in lab). 5. Based on this lab, give your definition of a Base (Think of the characteristics or properties of the bases in lab). 6. Your skin and hair usually have a ph of about 5 or 6. If you use a ph balanced shampoo to clean yourself then what do you think the ph would be of the shampoo? 7. Write any thoughts you might have had on this lab or anything you might have observed that was interesting to you.


				
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posted:1/29/2010
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