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Homemade pH Indicator Project

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Homemade pH Indicator Project - Page Text Content

S: SUMMER 2012

BC: The End

FC: 2012 | Chemistry Honors | pH Indicator Project

1: Initially, when I searched for homemade pH indicators, all I could find was red cabbage. Upon further research (including asking other people what they were using), I decided upon red grape juice. Another choice I considered were beets. The red grape juice is an acid, ranging somewhere in 2-2.5 area on the pH scale. Most of the bases I tested changed colors, which is indicative of an acid indicator.

2: The First Trial: Grape juice from concentrate

3: Lime Juice | Minimal change if any; lime juice is an acid. This reaction was expected.

4: Bleach | The juice turned yellow-white when bleach was added; since bleach is a base, this reaction makes sense.

5: Human Saliva | The saliva made no change to the grape juice, however it is not acidic. Saliva is neutral.

6: Non-Aerosol Hairspray | The only significant change to the grape juice was an unusual white precipitate.

7: 1% Milk | The grape juice congealed with the milk. The milk instantly curdled. It was nasty.

8: PINK Body Lotion | No change to either substance. With the knowledge I have of acids and bases, I believe the lotion is a base.

9: Nail Polish Remover | No color change, which surprised me. I assumed polish remover was a base, although it could be a base not registered by the grape juice.

10: Olive Oil | The olive oil didn't react at all with the grape juice. It just floated on top of it, doing its own thing.

11: The dish detergent turned the juice an ugly black color; it was very, very basic. | d i s h d e t e r g e n t

12: Baking Soda | The juice turned purple-black when baking soda was added. Baking soda is also a strong base.

13: The Second Trail: Freshly squeezed grape juice

14: NOTE: I recorded only significant differences between my two trials.

15: BLEACH | The bleach in fresh juice formed a precipitate.

16: Hairspray | Like with the bleach, this formed a precipitate.

17: 1% Milk | The milk also formed a precipitate; it was nasty and I had to scrape it out of my glass for the next test.

18: Dish Detergent | The dish detergent was initially bright red, but changed back to yellow before I could snap the picture.

19: Baking Soda | B U B B L E S

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  • By: Brady H.
  • Joined: almost 6 years ago
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  • Title: Homemade pH Indicator Project
  • 10 mod Honors Chem Final
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  • Published: almost 6 years ago