How do I get the indicator out of an onion?

Question

I'm doing a project on indicators and need to know how to get the indicator solution out of an onion.

If anyone knows any info on this, please let me know asap!

Thanks a bunch!

Answer 1

In theory, any substance that undergoes a reversible chemical change when pH changes can be used as an acid-base indicator. In practice, a sharp change in some easily detectable property of the substance is required. Usually, the property is color; but other properties such as odor can also change with the pH.

Onion is an olfactory indicator. The onion odor isn't detectable in strong basic solutions. Red onion can act as a visual indicator also. It changes from pale red in acid solution to green in basic solution.

Good Luck, hope you get an "A" ;-)

http://chem.lapeer.org/Chem2Docs/Olfacto...

Answer 2

There's now way u can completely get rid of the indicator.

Use another sample for testing, or if u really want the colour changed, put what I call the anti-indicator to change to normal colours.