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Acid and Base

Page history last edited by Anna 16 years ago

Acid or Base?

 

Testable Question:

  • How does the pH level of a liquid affect if a liquid is an acid or a base?

 

Definitions:

  • Acid:
  • Base:
  • pH:


Materials:

  • Coke

  • Vinegar

  • Water

  • Lemon Juice

  • Windex

  • Sodium Bicarbonate (Baking soda mixed with water)

  • Ammonia

  • Liquid Starch

  • Sample Tray

  • pH paper

  • pH scale (DO NOT REMOVE FROM ZIPLOC BAG)

 

Procedure:

  1. Take the Sample Tray and place 5 drops of coke into hole #1.

  2. Repeat step 1 for the rest of the liquids.  Look at the data table to see the proper placement for each liquid

  3. Take each pH paper and rip each one into two equal pieces so you have 8 pieces.

  4. Dip one of the pH papers into the coke. The pH paper should turn into a different color.

  5. Wait about 10 seconds and look at the pH scale, (DO NOT REMOVE FROM ZIPLOC BAG), and compare it with the pH paper.  YOU MUST DO THIS WITHIN 30 SECONDS OR YOUR RESULTS WILL BE INACCURATE!!

  6. Take a Picture of the pH paper and insert it into the data table

  7. Record the pH number that goes with the color into the data table.  Then Identify if the liquid is an Acid, Base, or Neutral

  8. Repeat steps 4 - 7 for each liquid.

 

Results/Data Table:

Liquid

pH number

Acid, Base, or Neutral?

 Picture of pH paper

1 - Coke

5

acid

  

2 - Vinegar

4

acid

  

3 - Water

7

neutral

  

4 - Lemon juice

2

acid

  

5 - Windex

8

basic

  

6 - Sodium Bicarbonate

9

basic

  

7 - Ammonia

10

basic

  

8 - Liquid Starch

9

basic

  


 

Conclusion:

 

 

 

        An acid is lighter unlike the base it a darker color. The acid makes a material get a light color because of the liquid that they are using.

And same for base but darker colors.

 

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