During the titration of ammonium hydroxide (taken in a conical flask) against dilute hydrochloric acid, which indicator is most suitable and what is the colour change observed at the end point?

Step-by-step solution

The titration is between ammonium hydroxide ( NH₄OH ), a weak base, and dilute hydrochloric acid ( HCl ), a strong acid. The salt formed at the equivalence point is ammonium chloride ( NH₄Cl ), which undergoes cationic hydrolysis to give an acidic solution with a pH less than 7 . For a strong acid-weak base titration, an indicator with a working pH range in the acidic region is required. Methyl orange, which has a pH range of 3.1 to 4.4 , is the most suitable indicator. Since the weak base ( NH₄OH ) is taken in the