Julien G S Page3

Colored indicators of natural pH, does it exist?

Of course, colored indicators of natural pH exist, such as red cabbage or beetroot, it is the latter that we will use for this experiment. they define whether a solution is basic or acidic.

1/3. material: bleach and vinegar- 3 cups - beetroot juice

2. Protection: gloves, gown and protective glasses

4. handling time: about 15 minutes

5. This manipulation will highlight the acidity or alkanity of a medium thanks to the color of the beet

6. risk and danger: risk of skin burn due to bleach and vinegar

7. mesure de prévention: put on gloves, gown and glasses when handling

8. hypothesis: when we put the bleach, the beet will become more yellow, because the middle will be basic, tends with the vinegar, the beet will become red, because the middle will be more acid.

9. Handling: fill three cups with beet juice. put them in line on a sheet of paper then haunt the sheet of paper, then put the bleach in a cup then the vinegar in another cup, then wait until the color changes

10. result: Beet with bleach became yellow and beet with vinegar became red.

11/12. Analise: We can object that the beet has to change color with the change of pH, and that in a basic medium, it becomes yellow, and that in an acid medium, it becomes red, we can therefore conclude that beet allows to identify if a medium is acidic or basic, thanks to its reaction of change of color in acidic and basic medium.