Question 20
Boojho, Paheli and their friend Golu were provided with a test tube each containing China rose solution which was pink in colour. Boojho added two drops of solution ‘A’ in his test tube and got dark pink colour. Paheli added 2 drops of solution ‘B’ to her test tube and got green colour. Golu added 2 drops of solution ‘C’ but could not get any change in colour. Suggest the possible cause for the variation in their results.
China rose is an acid-base indicator.
China rose in different medium shows following reactions:
China rose + acid ⟶ gives dark pink colour, hence solution 'A' is acidic in nature.
China rose + base ⟶ gives green colour, hence solution 'B' is basic in nature.
China rose + neutral ⟶ no change in colour, hence solution 'C' is neutral in nature.