Question

what is indicator?write the name of two natural & two synthetic indicators

Answer 1

Indicator is a substance which helps in identifying the chemicals as acidic, basic or neutral.
Natural Indicators - China Rose, Turmeric
Synthetic Indicator - Litmus paper or solution, Phenolphtalene..

Answer 2

Explanation:

Indicators are the substances used to show change in color due to the change in pH.

For example, Phenolphthalein when added to acidic solution, it appears colorless. When Phenolphthalein is added to basic solution then it appears pink in color.

Natural indicators are the substances used to determine the pH of a substance. For example, turmeric and beet root juice are the natural indicators.

Synthetic indicators are the man-made indicators used to determine the pH of a substance. For example, methyl orange and Phenolphthalein are synthetic indicators.