Medium acidic. in the first tube and
econd.
A green plant such as pelargonium supplied with
a strictly mineral liquid is exposed to an air draft
that traverses a solution of sodium bicarbonate
(NaHCO3) labelled by radioactive carbon C. Few
drops of phenolphthalein are added.
Phenolphthalein becomes dark pink in a basic
medium. The chemical reaction liberating carbon
dioxide is represented below:
A
CO.
how can you explain the change in color of phenolphthalein into dark pink?