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I remember doing this experiment in the equivalent of seventh grade and I loved it. It's one of the experiment which made me love science. It's simple but you learn a lot in a fun and interesting way

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This is the usual method of finding the pH of a solution.

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NC Standard Course of Study Standards (K-12) : Science

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NC Standard Course of Study Standards (K-12) : Science

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- environment
- change
- reaction
- experiment
- measure
- test
- hypothesis
- deduction
- discovery
- components

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This is the method with the Red Cabbage

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_Red cabbage juice used as pH meter
_Lemon juice (acide pH = 3)
_Water (pH = 7)
_diluted baking soda (basic pH = 9)
_several other liquids from a household

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Why do lemons taste like this ? How can we qualify its taste compared to baking soda's taste ?

What is pH ? How do we measure it ? What is the pH of different liquid ?