Q. During titration of acetic acid with aq. solution, the neutralisation graph has a vertical line. This line indicates Chemistry Question Image

 1608  237 AIIMSAIIMS 2007Equilibrium Report Error

Solution:

In any type of acid base titration, there is a sudden change in the pH value at the end point. During the titration of a weak acid with a strong base, beyond the equivalent point, the solution will contain the salt and excess of free base.

Due to the presence of free base, solution becomes alkaline in nature.