Question

give information about all the types of natural and synthetic indicators.

Answer 1

Some types of artificial and natural indicators with their corresponding change in colour is mentioned below.

Indicator	Acid	Base	Occurrence
Thymol Blue	red	yellow	Artificial
2,4-Dinitrophenol	colourless	yellow	Artificial
Methyl yellow	red	yellow	Artificial
Methyl orange	red	orange	Artificial
Alizarin sodium sulphonate	yellow	violet	Artificial
Methyl red	red	yellow	Artificial
onion	Pale red	green	Natural
Phenol red	yellow	red	Artificial
Neutral red	red	yellow	Natural
Phenolphthalein	colourless	red	Artificial
Alizarin yellow	yellow	lilac	Natural