Question

What is indicator and what deos it works​

Answer 1

Indicators are substances whose solutions change color due to changes in pH. These are called acid-base indicators. They are usually weak acids or bases, but their conjugate base or acid forms have different colors due to differences in their absorption spectra

Answer 2

Answer:

indicator is used to determine whether the chemical is acidic or basic........

eg.methyl red, methyl orange, phenolphthalein......etc