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Lemonade Science (page 2)

based on 16 ratings
Author: Ora Chaiken

 Experimental Procedure

  1. Make a chart or print out one below.
  2. Record your hypothesis of the pH level of the first four items. Lemon juice is an acid, with a pH less than 7. How acidic do you think your lemon juice is? Water should be neutral, neither acid nor base, with a pH level of approximately 7. What do you think about the sugar and baking soda?
  3. Pour one tablespoon of lemon juice into first cup.
  4. Pour one tablespoon of sugar into second cup, and add a tablespoon of water. Mix well.
  5. Pour one tablespoon of baking soda into third cup, and add a tablespoon of water. Mix well.
  6. Pour one tablespoon of water into fourth cup.
  7. Test the pH level of each of the 4 items, using the strips of paper and the chart that came with the paper. Record your observations on the chart.
  8. Taste each item in turn.
  9. Record on your chart how each item tastes: sweet, sour, salty, bitter or umami (savory).
  10. If you want to test your saliva, you can spit onto one of the spoons. Then test the saliva in the spoon on the pH paper.
  11. Stir together one cup of water, the sugar water and the tablespoon of lemon juice to make lemonade.
  12. Drink some and enjoy.
  13. Test the pH of the lemonade.
  14. Mix one tablespoon of dry baking soda into the lemonade. 
  15. Write down your observations.
  16. Test the pH of the lemonade/baking soda solution. Taste a little if you wish.
  17. Add one more tablespoon of baking soda and check the pH level again.
  18. You can measure the pH of other items, like the orange or apple juice, club soda or liquid soap.
  19. Congratulations! You have finished your first test. To see if your results are accurate, you can run this experiment again. Repeat steps 3 – 7, 11-13, and 14-16 twice more, and record your results in the “Test 2” and “Test 3” columns of the chart.
Sample Documentation Chart:
Item

Taste

(Sweet, Salty, Bitter, Sour or Umami-savory)

pH
Hypothesis

pH

Test 1

pH

Test 2

pH

Test 3

Lemon Juice

 
 
 
 
 
Water
 
 
 
 
 

Sugar Water

 
 
 
 
 

Baking Soda in Water

 
 
 
 
 
Lemonade
 
 
 
 
 

Lemon Juice with Baking Soda

 
 
 
 
 
Saliva
 
 
 
 
 
Other:
 
 
 
 
 
Other:
 
 
 
 
 

Bibliography

  1. Environmental Protection Agency: Acid Rain
  2. Dictionary.com

 

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