Explain why no indicator can be used for the titration between formic acid and ammonium hydroxide

Explanation

In acid-base titrations, the end point is detected by the use of a substance called acid-base indicator. Acid-base indicator exhibits a sharp change in its colour at the end point. The experimentally determined point of completion of an acid-base titration is called end point. for the titration between a weak acid and weak base, there is no sharp change in pH. Hence, no indicator can be used