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:
CO2
(3)
2NaHCO3 - Na2CO3 + CO2 (g) + H2O
Ds) and few drops
Chi loves
how can you explain the change in color of phenolphthalein into dark pink?