A. I am a natural indicator. I turn my pink color to deep pink in an acid and green in a basic solution. I am …………………. B. I am a synthetic indicator. I turn red in acidic solution and yellow in basic solution. I am ………………. C. I am an organic dye. I am colorless. Bases turn me pink while acids and neutral substances do not affect me. I am ……………….

An indicator is a substance used to detect the presence of an acid or base as characterized by the indicators color change. An indicator can either be natural or synthetic depending on whether it is obtained from naturally occurring substance (natural) or synthesized in a laboratory (synthetic).

A. China rose is a type of natural indicator that turns deep PINK or MAGENTA in the presence of an acid or GREEN in the presence of a base.

B. Methyl red is a synthetic Indicator that turns RED in the presence of an acid or YELLOW in the presence of a base.

C. Phenolphthalein is an organic dye that is originally colorless but turns PINK in the presence of a base but remains colorless in the presence of an acid or neutral substance.